THE DIABLO CANYON FAUNA: A COARSE-GRAINED RECORD OF...
Transcript of THE DIABLO CANYON FAUNA: A COARSE-GRAINED RECORD OF...
THE DIABLO CANYON FAUNA:A COARSE-GRAINED RECORD OF TRANS-HOLOCENE FORAGING
FROM THE CENTRAL CALIFORNIA MAINLAND COAST
Terry L. Jones, Judith F. Porcasi, Jereme W. Gaeta, and Brian F. Codding
Decades ago the Diablo Canyon site (CA-SLO-2) on the central California mainland revealed one of the oldest and longestsequences (ca. 9400 radiocarbon years ago to contact) of coastal occupation on the shore of the northeastern Pacific. Theartifacts from these important deposits were reported in detail by Greenwood (1972), but only a fraction of the site’s fau-nal collections was analyzed in the original site report. Acquisition of 30 additional radiocarbon dates and analysis of thecomplete vertebrate fauna have produced a coarse-grained record of human foraging on the California mainland from 8300cal B.C. to cal A.D. 1769. The temporally controlled faunal matrix, constituting one of the largest trans-Holocene recordsfrom western North America, speaks in a meaningful way to two significant issues in hunter-gatherer prehistory: earlyHolocene foraging strategies and economic intensification/resource depression over time. The site’s earliest componentsuggests a population invested in watercraft and intensely adapted to the interface of land and sea along the northeasternPacific coastline. While boats were used to access offshore rocks, terrestrial mammals (e.g., black-tailed deer) were also ofprimary importance. Dominance of deer throughout the Diablo occupations is inconsistent with recent generalizations aboutbig-game hunting as costly signaling in western North American prehistory. Diachronic variation, correlated with super-imposed burials that show growth in human populations through the Holocene, includes: (1) modest incremental changesin most taxa, suggesting resource stability and increasing diet breadth; (2) gradual but significant variation in a few taxa,including the flightless duck which was hunted into extinction and eventually replaced by sea otters; (3) punctuated, mul-tidirectional change during the late Holocene related to historic contingencies of the Medieval Climatic Anomaly and pro-tohistoric disruptions.
Hace décadas, el sitio de Cañón de Diablo (CA-SLO-2) en el continente central de California reveló uno de las sucesionesmás viejas y más largas (ca. 9400 años del radiocarbono hace contactar) de la ocupación costera en la costa pacífica delnoreste. Los artefactos de estos depósitos importantes fueron informados con todo detalle por Greenwood (1972), pero sólouna fracción de las colecciones de faunal de sitio fue analizada en el informe original del sitio. La adquisición de 30 fechasadicionales de radiocarbono y análisis de la fauna completa del vertebrado ha producido un registro de grano gruesa delhumano que adentra en el continente de California de 8300 B.C. al 1769 A.D. La matriz temporalmente controlada de faunal,constituyendo uno de los registros más grandes de trans-Holocene de Norteamérica occidental, habla en una manera signi-ficativa a dos asuntos significativos en la prehistoria de cazador-recolector: Holocene temprano que adentra las estrategias,y la depresión económica del intensificación recurso con el tiempo. El componente más temprano del sitio sugiere a una poblacióninvertida en el watercraft e intensamente adaptado al comunica de la tierra y el mar por el litoral pacífico del noreste. Mien-tras los barcos fueron utilizados para conseguir acceso a piedras cercanas a la costa, mamíferos terrestres (por ejemplo, venadode negro-tailed) fueron también de primordial importancia. La dominación de venado a través de las ocupaciones de Diabloes contradictoria con generalizaciones recientes acerca del juego grande que caza señalar como costoso en la prehistorianorteamericana occidental. La variación diacrónica, tuvo correlación con entierros sobrepuestos que muestran el crecimientoen poblaciones humanas por el Holocene, incluyen: (1) los cambios de incremento modestos en la mayoría de las tasas, sugiriendola estabilidad del recurso y la anchura creciente de la dieta; (2) la variación gradual pero significativa en unas pocas tasa,inclusive el pato incapaz de volar que fue cazado en la extinción y finalmente reemplazado por nutrias de mar; (3) el cambiopuntuado y multi-direccional durante el tarde Holocene relacionó a contingencias históricas de las interrupciones Climáti-cas Medievales de Anomalía y protohistoric.
Terry L. Jones ■ Department of Social Sciences, California Polytechnic State University San Luis Obispo, CA 93407([email protected]) Judith F. Porcasi ■ Cotsen Institute of Archaeology, University of California, Los Angeles, CA 90095 ([email protected])Jereme W. Gaeta ■ Center for Limnology, University of Wisconsin, 680 N. Park, Madison, WI 53706 ([email protected]) Brian F. Codding ■ Department of Anthropology, Stanford University, 450 Serra Mall, Building 50, Stanford, CA 94305-2034 ([email protected])
American Antiquity 73(2), 2008, pp. 289–316Copyright ©2008 by the Society for American Archaeology
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Over the last 20 years the California coasthas emerged as a major testing ground forhunter-gatherer theory. Optimal foraging,
economic intensification, extensification, overex-ploitation, neo-Marxism, costly signaling, andother theories have been applied to the Californiacoast, all with varying degrees of credulity. Withnotable exceptions (e.g., Arnold’s [1992a, 1992b,2001] focus on beads and craft specialization andBasgall’s [1987] artifact-based economic intensi-fication model), most of these applications havefocused on faunal remains, particularly those fromhighly stratified deposits on the Channel Islands.In the last two decades, Channel Island archaeol-ogists have demonstrated that certain coastalresources (e.g., shellfish and fish) were exploitedmuch earlier (ca. 10,000–8000 cal B.C.) than pre-viously thought (Erlandson et al. 1996; Rick et al.2001), and that their use varied over time. Even onthe islands, however, long-term faunal sequencesthat provide critical tests for hunter-gatherer the-ory have been mostly pieced together with datafrom multiple, short-duration components, andtrans-Holocene faunal collections from single sitesare extremely rare. While sequences constructedfrom multiple sites can be quite valuable (e.g., But-ler and Campbell 2004), assemblages from singlesites avoid problems related to variability in habi-tats and methods of identification (see Gobalet2001).
In this paper we present findings from CA-SLO-2, one of six sites excavated at Diablo Canyon onthe central California mainland coast in 1968 (Fig-ure 1). While the artifact collection from this sitewas described in detail (Greenwood 1972), only aportion of the faunal remains was identified in theoriginal site report. The full collection reportedhere includes over 23,000 bird, mammal, reptile,and fish remains with over 12,000 identified to ameaningful taxonomic level (genus for mammalsand birds; family for fish). Findings from two col-umn samples are also available from the originalsite report in which an additional 12,165 fish boneswere reported (Fitch 1972).
Originally dated with three radiocarbon assays,30 additional dates now show that the faunal assem-blage from CA-SLO-2 is derived from four inter-mittent occupations between ca. 8300 cal B.C. andhistoric contact (A.D. 1769), making this one ofthe largest trans-Holocene faunal collections from
western North America. Owing to the unfortunaterealities of mainland environments (e.g., the pres-ence of ground-burrowing animals), the sequenceis more coarse-grained than those from the islandsor the stratified caves of the Great Basin. Nonethe-less, it speaks in a meaningful way to two signifi-cant issues in the hunter-gatherer prehistory: earlyHolocene adaptations, and economic intensifica-tion/resource depression over time. In contrast withthe southern California islands, the Diablo Canyonfauna show very few dramatic changes, insteadreflecting continuity of a broad-spectrum huntingstrategy that incorporated both marine and terres-trial taxa. The site’s initial Holocene component(8300–6500 cal B.C.) shows an intriguing coastaladaptation in which watercraft were used to accessoffshore rocks but terrestrial mammals were alsoof primary importance with a singular focus onblack-tailed deer (Odocoileus hemionus). Domi-nance of deer throughout the Diablo occupationsconflicts with recent generalizations about big-game hunting as costly signaling in western NorthAmerican prehistory. Reconciliation of the vari-ability in early Holocene hunting strategies repre-sented by Diablo Canyon as well as certaindiachronic patterns can only be accomplished bysupplementing notions of optimality, efficiency,and other evolved aptitudes with recognition oflocal environmental factors, historical contingen-cies (e.g., coastal colonization and the MedievalClimatic Anomaly), and by considering artifact pat-terns in tandem with the faunal data.
Early Holocene Adaptations
Perceptions of the earliest coastal prehistory of thenortheastern Pacific have advanced dramatically inthe last 20 years as finds from the northern Chan-nel Islands (Erlandson 1993, 2001, 2002; Erland-son et al. 1996, 2007; Johnson et al. 2002; Rick etal. 2001) have demonstrated that humans wereusing watercraft and exploiting fish and shellfishas early 10,000–9000 cal B.C. (Erlandson et al2007; Rick et al. 2001). Although issues remainconcerning the technological bases of these earlyisland adaptations (see Cassidy et al. 2004; DesLau-riers 2005; Erlandson, Braje, Rick, and Peterson2005; Erlandson et al. 2007; Rondeau et al. 2007),any interpretation of western North American pre-history must, based on the island findings, recog-
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Figure 1. CA-SLO-2 and other Terminal Pleistocene/early Holocene sites on the California Coast.
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nize the antiquity of nearshore and littoral adapta-tions, and the use of watercraft. Lacking terrestrialmammals after the extinction of megafauna, how-ever, the islands alone may not provide a completedefinition of the foraging strategies that accompa-nied initial human colonization of the northeasternPacific. Data from mainland coastal contexts areneeded to compliment the island findings since anypossible coastal migration route into North Amer-ica would have been marked by a much broaderarray of resources than the more limited suite foundon the southern California islands.
Much discussion of the subsistence base asso-ciated with these earliest coastal populations hasbeen framed in optimal foraging theory (e.g.,Erlandson 1991; Jones 1991; Kennett 2005:120;Raab and Yatsko 1992; Rick et al. 2005). In mostcases, researchers have sought to portray the dietof early colonists as a match for predictions ofeither a diet breadth or patch choice construct. Oflate, such interpretations have focused heavily onthe California Millingstone Culture that, as one ofthe oldest cultural complexes on the mainland, hasbeen frequently characterized as an optimal adap-tation focused heavily on gathered foods (e.g.,shellfish, seeds, and yucca) (Erlandson 1991; Jones1996; Jones et al. 2002) and small game (Hilde-brandt and McGuire 2002; McGuire and Hilde-brandt 1994). The importance of shellfish to earlyHolocene coastal populations has been repeatedlydemonstrated from the California archaeologicalrecord (Erlandson 1994; Erlandson, Vellanoweth,Rick, and Reid 2005; Fitzgerald 2000; Fitzgeraldand Jones 1999; Jones 2003; Jones et al. 2002), butthe importance of small game is more ambiguous.Relying on certain ethnographic observations (e.g.,Hawkes 1990, 1991, 1993), McGuire and Hilde-brandt (1994; Hildebrandt and McGuire 2002)argue that trapping of small and medium-sizedgame (e.g., rabbits and birds) was the optimal sub-sistence mode for early Holocene foragers, and thatthe pursuit of big game (including deer) was actu-ally a suboptimal activity that emerged only laterwhen climatic amelioration and increased humanpopulation provided a viable arena for high levelsof social competition via costly signaling. The basisof their model is the realization that while larger-bodied taxa tend to have higher average post-encounter return rates (e.g., Bayham 1979; Griffiths1975; Simms 1985; Ugan 2005), actual hunting
success had been shown to be extremely variablein some ethnographic settings due to high searchand pursuit failures (e.g., Hawkes 1990, 1991,1993, 1996; Hawkes et al. 1991, 2001), which maybe due to a prey’s relative mobility (Sih and Chris-tensen 2001). If nothing else, these challenges totypical archaeological applications of optimal for-aging theory suggest that body mass is not a viablemeasure of prey rank and that to distinguishbetween reliable and variable hunting, researchersshould pay close attention to local environmentalcircumstances (e.g., Elston and Zeanah 2002;Hockett 2005; Zeanah 2004).
CA-SLO-2 at Diablo Canyon is one of 23coastal or peri-coastal sites in California that haveproduced radiocarbon evidence for occupationbetween 11,000 and 7000 cal B.C. (Erlandson etal. 2007; Porcasi 2008) (Figure 1), although onlytwo of these (Daisy Cave and Arlington Man) haveproduced substantial evidence for pre-8000 cal B.C.habitation. The majority of the earliest coastal siteshave yielded extremely small collections of birdand mammal remains. Many of the larger assem-blages including those from CA-SON-348/H(Kennedy et al. 2005; Porcasi 2008; Schwaderer1992; Wake and Simons 2000) and CA-SCL-178(Fitzgerald and Porcasi 2003) are dominated byrabbits and conform with Hildebrandt andMcGuire’s generalizations about early Holocenefaunal exploitation. Nonetheless, the available sam-ple for the earliest Holocene is sufficiently limitedthat new findings from a substantial collection likethat of Diablo Canyon are potentially meaningfuland important, especially as they stand to shed lighton the variable expressions of past human adapta-tions in response to local environmental conditions.
Economic Intensification and ResourceDepression/Extirpation
Long-term faunal records are particularly valuablefor their potential to evaluate diachronic predictionsfrom optimal foraging and/or other behavioral eco-logical models (Bettinger 1991:100), and fauna-based regional models of hunter-gatherer resourceintensification have become increasingly commonin California (Broughton 1994a, 1994b, 1997,1999, 2002; Perry 2004) and elsewhere (e.g., But-ler and Campbell 2004; Lourandos 1983; Matson1983; Zvelebil 1989). Many of these suggest that
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increasing reliance on lower-ranked taxa throughtime was the result of localized suppression or extir-pation of higher-ranked species as a result of over-exploitation (e.g., Broughton 1994a, 1994b, 1997,1999, 2002; Hildebrandt and Jones 1992; Jones etal. 2004; Kay and Simmons 2002; Lyman andWadley 2003; Salls 1992). In light of such efforts,economic intensification has become essentiallyan assumption of California prehistory despite lessthan compelling empirical support in some cases.In the absence of such evidence, recent modelshave challenged some of the prevailing assump-tions about foraging efficiency over time. Hilde-brandt and McGuire (2002) and McGuire andHildebrandt (2005) in particular have proposed alogical diachronic extension of their characteriza-tion of early Holocene optimality, suggesting thatincreased pursuit of deer in western North Amer-ica resulted from amelioration of climate and reduc-tion of demographic stress at the end of themid-Holocene climatic optimum. Increased envi-ronmental productivity ostensibly lessened pres-sures on individuals and provided male hunters theopportunity to engage in riskier hunting strategieswith more variable return rates, thereby creating anew arena for social competition in which huntingsuccess honestly signaled an individual’s underly-ing qualities and could have ultimately resulted inthe achievement of higher status (see Bliege Birdand Smith 2005; Bliege Bird et al. 2001; Grafen1990a, 1990b; Smith 2004; Zahavi 1975). Thisinterpretation was subsequently challenged onempirical grounds by Broughton and Bayham(2003) and Byers and Broughton (2004) who sug-gested that deer simply were not present in muchof western North America during the mid-Holoceneoptimum (see also Hocket 2005; Zeanah 2004).Following the standard predictions of diet breadth(or prey choice) models (see Schoener 1971;Stevens and Krebs 1986), they state that mid-Holocene increases in deer exploitation reflect thegreater availability of the species on the landscape.With an exceptionally large sample of deer remainsfrom trans-Holocene contexts, the Diablo Canyoncollection is extremely relevant to issues raised inthis debate.
Limiting the value of diet breadth applicationsin California, however, is the fact that opportuni-ties to record ethnographic animal exploitationpractices and define resource return rates had long
passed by the time that optimal foraging theorywas developed. There are no accurate ethnograph-ically based resource return values for Native Cal-ifornia foods and their absence limits the potentialto apply optimal foraging constructs in a stricthypothetical-deductive framework. In the absenceof such values, researchers have relied on estimatesbased on historical ethnography (Simms 1985),experimentation (e.g., Jones and Richman 1995;Jones and Ferneau 2002; Raab 1992), and eth-noarchaeological observations from other parts ofthe world (e.g., Bliege Bird and Bird 1997). In ourtreatment of the Diablo fauna we refer to these esti-mates, but treat the values as guides for interpreta-tion rather than a basis for strict resource ranking.Given that the local failure rates for such taxa areunknown and that the site collection includes theremains of one extinct taxon (the flightless duck[Chendytes lawi]) and another (the sea otter [Enhy-dra lutris]) whose modern range and habitat differconsiderably from pre-contact situations, develop-ing or applying conjectural quantitative return val-ues in a rigid fashion seems unwarranted.
The Diablo Canyon Site (CA-SLO-2) and Its Fauna
CA-SLO-2 is an unusually large (ca. 400 x 320 m),deep midden, situated on a narrow coastal terraceon the north bank of Diablo Creek in San LuisObispo County, California. The site is one of nearly50 shell middens on the coastal edge of a 20-kmlong peninsula that extends 8 km into the PacificOcean between Morro and San Luis Obispo bays(Figure 1). Low coastal mountains known as theIrish Hills rise to elevations of 550 m immediatelyto the east of the coastal terrace upon which CA-SLO-2 is situated. Covering an area of ca. 150 km2,the Irish Hills consist of a series of narrow, steepridges and intervening drainages covered with adense mosaic of coastal oaks, chaparral, and occa-sional grassland. Few archaeological sites havebeen recorded in the Irish Hills, and the area todaystill has still a low number of inhabitants and servesas an informal game refuge.
Excavation Sampling Methods
Of the six sites investigated by Roberta Green-wood in 1968 in anticipation of construction ofDiablo Canyon Nuclear Power Plant, CA-SLO-2
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was the deepest and most complex. The site wasin the direct impact area of a road that was plannedas an access to a power plant, and Greenwood’sinvestigations were undertaken to mitigate theimpacts of the road construction. She employeda mixed recovery strategy that was designed tosample artifacts, and micro- and macro-faunalremains effectively. In the area of her investiga-tions, the site extended to a depth of 3.4 m. A totalof 30 1-x-2-m units were excavated in arbitrary10-cm levels and processed with 6 mm mesh. Twocolumn samples were recovered for microanaly-sis: a .25-x-.25-m column excavated to the baseof the deposit (.8 m3) that was water-processedwith 1 mm mesh to recover fish bones, and a 1-x-1-m unit, processed with nested 6 mm and 3 mm(1⁄8 inch) mesh to recover shell remains. Green-wood (1972:5) reported a total recovery volumeof 109 m3, but data from only 98.9 m3 were avail-able for the current study due to attrition of thecollection during its 35 years in storage. Findingsfrom the fish column (Fitch 1972) and shell col-umn were reported in detail in the 1972 mono-graph, as was the site’s artifact collection(Greenwood 1972).
Stratigraphy, Cultural Chronology,and Distribution of Temporal Components
As is often the case on the California mainland,Greenwood (1972) found that the deep midden atCA-SLO-2 was relatively homogeneous with lit-tle evidence of discrete layering or physical stratig-raphy. Rather, she noted a gradual transition in soilcolor between the upper (0–150 cm; black), mid-dle (150–250 cm; very dark brown), and basal(250–340 cm; very dark yellowish brown) levels.A distinct calcium carbonate precipitate (caliche)was noted below 150 cm, which is common indeposits of early and middle Holocene in the region.In the absence of physical stratigraphy, Greenwoodrelied on three radiocarbon dates and a robustassemblage of formal artifacts to define three cul-tural components: a basal variant of the CaliforniaMillingstone Culture, dating ca. 9,400–5,000 yearsago; a Hunting Culture component in the middlelevels of the deposit, dating ca. 5,000–1,000 yearsago; and a Late Period or Canaliño component,post-dating 1,000 years ago, above 120 cm. Tworadiocarbon dates in excess of 9,000 radiocarbonyears from the base of the deposit made CA-SLO-
2, at the time of its reporting, one of the oldestcoastal sites in North America.
A total of 341 radiocarbon dates is now availablefrom CA-SLO-2 (Table 1). This enhanced chrono-metric data base generally corroborates Green-wood’s cultural-stratigraphic assessment of thesite’s occupational history, although four compo-nents can now be recognized rather than three (Table2). Radiocarbon results also indicate some vertical,intercomponent mixing due to rodent activity andthe presence of 66 human burials. The four tempo-ral components exhibit reasonable superposition(Figure 2), but bioturbation from rodent activity isan unfortunate reality on the California mainlandthat forces researchers to rely on sequences morecoarse-grained than those from the Channel Islands.Even the nearby Cross Creek Site, which is con-temporaneous with the oldest levels at DiabloCanyon and exhibited exceptional physical stratig-raphy, was also compromised by some intercom-ponent mixing (Fitzgerald 1998, 2000; Jones et al.2002). The 33 radiocarbon dates that define the Dia-blo sequence show a distinctive trend toward super-position. On the most coarse-grained level,occupation below 200 cm marks the early Holocenebetween 8300 and 3000 cal B.C., while the lateHolocene (1600 cal B.C.–contact) is representedabove 200 cm. Of 16 radiocarbon dates obtainedfrom below 200 cm, only one (1600 cal B.C.)reflects down-mixing of late Holocene materialsinto the early Holocene levels. Five early Holocenedates, however, were recovered from above 200 cmreflecting the upward movement of older materialsinto the late Holocene levels. The radiocarbonrecord further exhibits a distinctive occupationalhiatus of 1,400 years separating the early and lateHolocene occupations, but this period of abandon-ment is not distinguished by a visible soil stratum.These early and late Holocene macro-componentscan be further divided into shorter-duration culturalsubcomponents. The lowest arbitrary levels(280–340 cm; component I) mark an early Holocenevariant of the California Millingstone Culture, com-parable to that found at the Cross Creek site (CA-SLO-1797; Fitzgerald 1998, 2000; Jones et al.2002). A later, more substantive Millingstoneexpression dating 7000–3000 cal B.C occursbetween 200 and 280 cm (component II). Threehuman burials were associated with the Milling-stone levels (one Early and two Late). Site use dur-
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ompo
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ragm
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es c
alib
rate
d w
ith th
e pr
ogra
m C
AL
IB 3
.3 (
Stui
ver
and
Rei
mer
199
3). R
ound
ed c
alen
dar
ages
incl
ude
mid
poin
t (in
pare
nthe
ses)
and
age
ran
ge a
t one
sig
ma.
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m I
ngra
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outh
on (
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AQ73(2) Jones 4/9/08 9:24 PM Page 295
ing the late Holocene is marked primarily by a Mid-dle Period component dating 1600 cal B.C.- calA.D. 1000 (component III), with a very minor occu-pation during the Late Period between cal A.D. 1500and contact (component IV). As with many sites onthe central California mainland, CA-SLO-2 wasabandoned during most of the Medieval ClimaticAnomaly (cal A.D. 800–1350; Stine 1994), with anoccupational hiatus evident between cal A.D. 1000and 1500. A total of 63 human burials was associ-
ated with the late Holocene occupation, contribut-ing substantially to mixing of materials between theMiddle and Late Period components. However, thesuperimposed early (N = 3) and late (N = 63)Holocene burial populations provide rare empiricalsupport for population growth within the immedi-ate site vicinity over the course of the Holocene. Thisrenders CA-SLO-2 unusually important withrespect to theoretical models that incorporate pop-ulation pressure as a causal variable.
296 AMERICAN ANTIQUITY [Vol. 73, No. 2, 2008]
Table 2. Component Summary, CA-SLO-2.
Depth Geologic Cultural Radiocarbon Calendric Age Excavation Component (cm) Age Period Dates (N) (calibrated) volume (m3)
IV 0-70 Late Holocene Late Period 3 A.D. 1500-contact 29.0III 70-200 Late Holocene Middle Period 11 1500 B.C.- A.D. 1000 49.5
(Hunting Culture)II 200-280 Early Holocene Late Millingstone 8 5000-3000 B.C. 17.4I 280-340 Initial Holocene Early Millingstone 7 8300-6500 B.C. 3.0Total 29* 98.9
*Four non-superpositioned dates excluded.
Figure 2. Depth-distribution of radiocarbon dates from CA-SLO-2.
AQ73(2) Jones 4/9/08 9:24 PM Page 296
The coarse-grained character but overall verti-cal integrity of the occupational components rep-resented at Diablo Canyon are attested to by thedistribution of secure temporal markers (Table 3).Bones from the flightless duck (Chendytes lawi)that went extinct early in the late Holocene ca. 500cal B.C. are most abundant in the Millingstone andMiddle Period levels of the deposit. One bonerecovered from Late Period contexts, postdating thespecies’ extinction, reflects upward mixing. Thepresence of only two Cottonwood arrow points isconsistent with relatively minor use of the site dur-ing the Late Period. One of these was found in theMiddle Period excavation levels as a product ofdownward, intercomponent mixing. Certainfishing-related implements (notched and groovedstone weights, circular shell hooks) dated no ear-
lier than 1500 cal B.C. in central and southern Cal-ifornia (Jones 2003; Jones et al. 2007; King 1990;Rick et al. 2002), were almost wholly restricted tothe Middle and Late Period levels at DiabloCanyon. Only one of these late Holocene artifactswas recovered from below 200 cm.
Component Function
Interpretation of the Diablo Canyon fauna cannotbe disassociated from the site’s role in regional set-tlement systems since any change in the characterof site use could contribute substantially to varia-tion in the relative frequency of taxa (Binford 1978,1980). While some variation in flaked stone tech-nology has been noted (Farqhuar 2003), the over-all Diablo tool assemblages show consistentdiversity (Table 4) that Greenwood (1972) attrib-
REPORTS 297
Table 3. Vertical Distribution of Temporal Markers, CA-SLO-2.
Cottonwood Notched Grooved Flightless DuckArrow Stone Stone Shell (Chendytes lawi)
Component points Weights Net weights Fishhooks Bones Total
IV (Late Period) 1 18 3 18 1 41III (Middle Period) 1 5 6 22 7 41II (Late Millingstone) 0 1 0 0 50 51I (Early Millingstone) 0 0 0 0 8 8
Total 2 24 9 40 66 141
Table 4. Component Artifact Assemblages, CA-SLO-2.
IV III II I TotalArtifact N % N % N % N % N
Milling slabs 1 .08 1 .13 0 .00 0 .00 2Handstones 2 .16 1 .13 8 2.91 1 2.44 12Mortars 17 1.39 6 .78 3 1.09 0 .00 26Pestles 17 1.39 8 1.04 4 1.45 0 .00 29Pitted stones 387 31.75 188 24.51 31 11.27 7 17.07 613Projectile points 161 13.21 104 13.56 31 11.27 2 4.88 298Other bifaces 144 11.81 122 15.91 62 22.55 5 12.20 333Scrapers/Flake tools 374 3.68 250 32.59 110 4.00 17 41.46 751Choppers 19 1.56 16 2.09 9 3.27 2 4.88 46Hammerstones 33 2.71 16 2.09 10 3.64 2 4.88 61Shell fishhooks 18 1.48 22 2.87 0 .00 0 .00 40Notched stones 18 1.48 5 .65 1 .36 0 .00 24Grooved stones 3 .25 6 .78 0 .00 0 .00 9Tarring pebbles 7 .57 6 .78 1 .36 0 .00 14Bone awls 15 1.23 12 1.56 4 1.45 5 12.20 36Bipointed bone gorges 3 .25 4 .52 1 .36 0 .00 8
Subtotal 1219 10.00 767 10.00 275 10.00 41 10.00 2302Margalef Diversity Index* 2.111 - 2.258 - 2.136 - 1.885 - 1.938Shell beads 233 - 1,246 - 23 - 4 - 1506
Grand total 1,452 - 2,013 - 298 - 45 - 3808
* Index calculated for all artifacts except shell beads; formula from Magurran (1988).
AQ73(2) Jones 4/9/08 9:24 PM Page 297
uted to continuity in the basic adaptation throughtime. Artifacts associated with the site’s basal occu-pation (component I) were relatively sparse, but allof the temporal components yielded diverse arraysof ground stone (handstones, milling slabs, mor-tars, pestles, and/or pitted stones), bone awls, pro-jectile points, bifaces, scrapers, and debitage thatreflect a wide range of domestic and subsistenceactivities. CA-SLO-2 clearly functioned as a resi-dential base during all four periods of its habita-tion, an assessment further supported by theassociation of human interments with each tem-poral component. The only significant change inthe tool inventory over time was the addition of fish-ing implements (circular shell hooks, notched andgrooved stones) during the late Holocene that weinterpret as technological innovations unrelated toany change in the overall character of site use.
Analytical Methods
The faunal sample included all bird, mammal, rep-tile, and fish remains recovered from the excava-tion of 1-x-2-m units processed with 6 m mesh.Faunal identifications were made through directcomparison with museum-curated specimens. Forbirds, mammals, and reptiles, reference collectionsfrom the Los Angeles County Museum of NaturalHistory and the Zooarchaeology Laboratory at theCotsen Institute of Archaeology at University ofCalifornia, Los Angeles were used, while refer-ence materials on file at the Department of Biol-ogy, California State University, Bakersfield, wereused for fish remains. All specimens were identi-fied to the most discrete taxonomic level possiblebased on diagnostic features. In the absence of suchfeatures, unidentifiable bones were assigned toclasses (i.e., mammal, aves, etc.), and (for birds andmammals) to size categories (small, medium, orlarge). In addition, the element, part of element,side, age, number, weight, and evidence of modi-fication (i.e., burned, gnawed, cut, or worked) were,to the degree possible, recorded for each specimen.For fish remains only the element and its weightwere recorded. For deer bones, which were a majorpart of the assemblage, MNIs were calculated foreach unit level. All artiodactyl elements were alsoassigned values based on Metcalfe and Jones’s(1988; see also Binford 1978) standardized wholebone food utility index (FUI), to examine variabil-ity in element representation and butchering strate-
gies. Overall dietary trends were evaluated by cal-culating the Margalef Index to evaluate diet breadthand the Berger-Parker index (in reciprocal form) toevaluate evenness or relative specialization (Magur-ran 1988) using the combined sample of bird, mam-mal, and fish remains recovered with the samesampling technique (6 mm mesh). Fish bone datareported by Fitch (1972) based on micro-recoverytechniques (1 mm mesh) were considered in tan-dem with the findings from the larger mesh sam-pling to compensate for the fish bone that was likelymissed with the larger aperture mesh used to exca-vate units. Fitch used a microscope to sort and iden-tify fish bones, and took ca. 900 hours to completehis identifications (Fitch 1972:102). Most of themicro-elements he identified were otoliths, teeth,and vertebrae.
Bird, Mammal, and Reptile Remains
A total of 13,517 bird, mammal, and reptile remainswas identified, including specimens from of a vari-ety of small burrowing animals (e.g., the Botta’spocket gopher [Thomomys bottae], and Californiaground squirrel [Spermophilus beecheyi ]). Elimi-nating all of these possibly intrusive elements andfurther restricting analysis to specimens identifiedto the genus level or better, the sample includes2789 NISP (Table 5), representing 29 species ofbirds, 15 terrestrial mammals, 7 marine mammals,and one reptile (the western pond turtle [Clemmysmarmorata]). Overall, the collection is dominatedby the remains of black-tailed deer (NISP = 1201;43 percent), sea otters (Enhydra lutris; NISP = 431;15.5 percent), cottontail rabbits (Sylvilagus sp.;NISP = 365; 13.1 percent), and cormorants (Pha-lacrocorax sp.; NISP = 278; 9.9 percent). All ofthese species are present in the site vicinity todaywith deer and cottontails abundant in the chapar-ral, grassland, and woodlands in the Irish Hillsimmediately to the east.
The site’s basal component (NISP = 44) showeda preponderance of black-tailed deer (NISP = 18;40.1 percent), cottontail rabbit (NISP = 8; 18.2 per-cent), and the extinct flightless duck (Chendyteslawi; NISP = 8; 18.2 percent). Aquatic birds over-all, including the sooty shearwater (Puffinusgriseus) and the flightless duck account for 38.6percent of the NISP. Component II (Late Milling-stone) was dominated by black-tailed deer (NISP= 187; 44.6 percent), cottontail rabbit (NISP = 66;
298 AMERICAN ANTIQUITY [Vol. 73, No. 2, 2008]
AQ73(2) Jones 4/9/08 9:24 PM Page 298
REPORTS 299Ta
ble
5. B
ird,
Mam
mal
,and
Rep
tile
Rem
ains
fro
m C
A-S
LO
-2 id
entifi
ed to
the
Gen
us L
evel
or
Bet
ter.
Lat
e P
erio
dM
iddl
e P
erio
dL
ate
Mil
ling
ston
eE
arly
Mil
ling
ston
eTo
tal
Taxo
nC
omm
on N
ame
NIS
P%
NIS
P%
NIS
P%
NIS
P%
NIS
P%
Terr
estr
ial M
amm
als
Can
issp
.D
og/C
oyot
e19
2.76
774.
7010
2.39
12.
2710
73.
84L
epus
cal
ifor
nicu
s Ja
ck r
abbi
t0
.00
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21
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03
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Odo
coil
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hem
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sB
lack
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led
deer
323
46.9
567
341
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187
44.6
318
4.91
1201
43.0
6Sy
vila
gus
sp.
Cot
tont
ail r
abbi
t70
1.17
221
13.4
966
15.7
58
18.1
836
513
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Oth
er T
erre
stri
al M
amm
als
(n =
11)
165.
8023
3.46
42.
580
.00
433.
86Su
btot
al42
862
.21
996
6.81
268
63.9
627
61.3
617
1961
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Mar
ine
Mam
mal
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nhyd
ra l
utri
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ter
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19.7
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r se
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hus
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n12
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029
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er M
arin
e M
amm
als
(n =
4)
5.9
75
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3.7
90
.00
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368
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otal
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-Mar
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dsN
on-M
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irds
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otal
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.67
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dsC
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ytes
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ight
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lican
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a aa
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irds
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2
AQ73(2) Jones 4/9/08 9:24 PM Page 299
15.8 percent), and the flightless duck (Chendyteslawi; NISP = 50; 11.9 percent). Component III(Middle Period) also showed black-tailed deer(NISP = 673; 41.1 percent) as the dominant taxon,followed by sea otter (NISP = 278; 16.9 percent)and cottontail rabbit (NISP = 221; 13.5 percent).Component IV (Late Period) was dominated byblack-tailed deer (NISP = 323; 46.9 percent), seaotters (NISP = 136; 19.8 percent), and cottontailrabbit (NISP = 70; 10.2 percent). Clearly, deer werethe most important taxon throughout the site’s occu-pation, remaining nearly constant in relative abun-dance. Variation in other species over time was alsoapparent as sea otters increased while the flightlessduck was gradually exploited into extinction. Othermarine mammals were insignificant in the overallassemblage and showed no change. Harbor seals(Phoca vitulina), the only pinniped represented inmeaningful numbers, accounted for ca. 5 percentof NISP from the late Millingstone Period onward.Marine birds decreased incrementally through theHolocene (from 38.6 percent to 11.2 percent) as didcottontail rabbits, albeit from only 18.2 percent to10.2 percent.
Black-tailed Deer. Given the evidence in otherparts of western North America for minimal use ofdeer during the early Holocene, the preponderanceof deer bone in the Diablo Canyon collections wasunexpected, although similar patterns showing thedominance of large game have been noted else-where including sites that cross the Pleistocene-Holocene boundary (Jochim 1998). In light ofongoing debate about the efficiency, variability, andsocial role of hunting large animals like deer(Broughton and Bayham 2003; Byers andBroughton 2004; Codding and Jones 2007; Hilde-brandt and McGuire 2002; McGuire and Hilde-brandt 2005; McGuire et al. 2007), and because theDiablo deer assemblage was so substantial, addi-
tional analyses were completed on these remainsrelying on Cannon’s (2003) central place foragerprey choice model.
Cannon’s (2003) model essentially relies on twovariables: (1) the relative importance of artiodactylsin the diet and (2) the representation of artiodactylskeletal elements that are used as a proxy for for-aging range and thus, relative reliability. First, anArtiodactyl Index was calculated as the ratio of allartiodactyl specimens relative to all artiodactylspecimens plus leporid specimens (e.g., Bayham1979; Broughton 1994b, 2002; Byers andBroughton 2004; Cannon 2000, 2003; Hildebrandtand McGuire 2002; McGuire and Hildebrandt2005), which shows a relative increase throughtime (Table 6). A �2 test of these values shows thatdifferences in artiodactyl relative abundancebetween components was significant (�2 = 9.38,p < .05). Further, to test whether or not thediachronic increase was significant, data were sub-jected to Cochran’s test of linear trend among pro-portions (cf. Cannon 2000, 2001, 2003), whichshowed that the temporal increase in artiodactylproportions over time was highly significant (�2
trend= 12.37, p < .001), which is consistent with pat-terns observed elsewhere in western North Amer-ica (e.g., Byers and Broughton 2004; Hildebrandtand McGuire 2002; McGuire and Hildebrandt2005). This trend is also mirrored in the weight ofdeer bone/m3 in the deposit over time (Table 7). Itshould not be overlooked, however, that this rela-tive trend differs substantially from the wholesalereplacement of rabbits by deer suggested in argu-ments made by Hildebrandt and McGuire (2002)and McGuire and Hildebrandt (2005) as deer con-stituted over 40 percent of all the non-fish verte-brate NISP throughout the entire occupation ofCA-SLO-2, including component I. The causeunderlying this pattern, however, is ultimately the
300 AMERICAN ANTIQUITY [Vol. 73, No. 2, 2008]
Table 6. Identified Artiodactyl and Leporid Specimens and Artiodactyl Index (AI) Values per Component, CA-SLO-2.
Artiodactyl LeporidComponent (NISP) (NISP) AI
IV (Late Period) 888 (2.96) 141 (-2.96) .863III (Middle Period) 705 (-1.81) 155 (1.81) .820II (Late Millingstone) 295 (-1.28) 67 (1.28) .815I (Early Millingstone) 27 (-1.07) 8 (1.07) .771
Parenthetical values represent the A.D. justed standardized residuals from �2 test performed on the element counts presentedin this table (�2 = 9.38, p < .05; �2 trend = 12.37, p < .001).
AQ73(2) Jones 4/9/08 9:24 PM Page 300
root of the Hildebrandt and McGuire/Broughtonand Bayham debate vis-á-vis whether late to mid-Holocene deer increases reflect efficient huntingdecisions resulting from higher prey densitiesspurred by climatic amelioration, or an increasedpropensity for males to engage in social competi-tion via costly signaling.
In an attempt to determine which explanationbest fits with the Diablo data, we relied on the sec-ond variable in Cannon’s (2003) model, whichexamines the relative abundance of deer on thelandscape through differential butchering practices.Based on the formal model developed by Metcalfeand Barlow (1992; see also Orians and Pearson1979), changes in butchering practices leading tothe deposition of artiodactyl parts with high eco-nomic value relative to low economic value wouldbe an anticipated outcome of increases in the dis-tances that hunters were traveling to pursue largegame such as deer.2 A total of 417 identifiable andnonrepetitive (per unit level) elements was eligiblefor inclusion in this analysis and was used to cal-culate mean (S)FUI values for each temporal com-ponent (Table 8). An analysis of variance of thesevalues shows no significant difference over time (F= .249, p = .861). Moreover, component values didnot vary significantly from the FUI values of a nullset of elements (i.e., from a whole artiodactyl skele-ton). This indicates that throughout the Holocene,foragers from CA-SLO-2 were consistently pro-
cessing and transporting the same sets of skeletalelements back to the residential base; further, thesesets never differed significantly from a whole artio-dactyl skeleton. This signifies that hunters werefrequently able to locate artiodactyls within a rel-atively short distance, and had no need to exten-sively process carcasses in preparation for extendedtransport. While this does suggest that huntingreturns did not decrease throughout the Holocene,it says nothing about whether or not returnsimproved. These results could be due to signifi-cantly large hunting parties, which could potentiallydivide up the load rather than differentially butcher,or to density mediated attrition (see Lyman 1984,1985, 1994). While the former variable is anunknown, the later has been shown to be insignif-icant in a number of other studies (e.g., Cannon2003; Lupo 1995), and soil acidity, which is themajor cause of deterioration of faunal remains inCalifornia, was not a problem at CA-SLO-2, whichshowed soil pH values between 7.0 and 8.4 (Green-wood 1972:49). Furthermore, an examination ofdeer age profiles also suggests that deer were rel-atively abundant throughout the Holocene, as therewas no obvious change in the deer age profile overtime (Table 9). The Diablo Canyon inhabitantsapparently exploited a consistently reliable deerpopulation in the adjacent Irish Hills throughout theHolocene, increasing their exploitation slightly dur-ing the late Holocene, but never to the degree that
REPORTS 301
Table 7. Volumetric Bone and Shell Densities per Cubic Meter and Ratios from CA-SLO-2.
Deer Fish Fish Fish Shell Shell Deer BoneBone Bone Bone Bone Weight/ Weight/ Weight/
Weight Weight NISP/m3 NISP/m3 Shell Deer Bone Fish Bone Fish BoneComponent (g)/m3 (g)/m3 (6 mm) (1 mm) (kg)/m3 Weight Weight Weight
IV 48.2 18.1 98.9 81,325 314.0 6.5 17.3 2.7III 68.2 22.3 123.9 86,621 364.7 5.3 16.3 3.1II 45.0 7.2 27.3 21,660 379.7 8.4 52.7 6.3I 2.1 5.2 23.0 13,760 26.9 13.0 5.2 3.9
Table 8. Mean Artiodactyl Body Part Utility from CA-SLO-2 by Component.
Mean Results of t-tests for differenceComponent (S)FUI NISP* SD from mean of null sample†
IV (Late Period) 36.0 99 24.3 t = -.72, p = .236III (Middle Period) 37.1 250 24.2 t = -.32, p = .374II (Late Millingstone) 35.6 64 23.4 t = -.79, p = .217I (Early Millingstone) 44.0 4 38.3 t = .54, p = .592
*Number of identified adult and sub-adult specimens to which (S)FUI values could be assigned.†Mean = 38.2, n = 118, SD = 2.3.
AQ73(2) Jones 4/9/08 9:24 PM Page 301
populations became sparse, or that deer became lessimportant than rabbits.
Fish
A total of 9,646 fish bones was identified from the6 mm sample; 6,070 to the family level or better(Table 10). Among the 30 taxonomic classes rep-resented in the identifiable sample, the remains ofrockfish (Sebastes sp.; NISP = 2,788) and cabezon(Scorpaenichthys marmoratus; NISP = 2,176) weremost abundant, both of which are common in thekelp beds and rocky areas along the Diablo coasttoday. Cabezon are relatively large fish (up to 75cm) that were probably taken with hook and line,although they might have been collected on occa-sion by hand from tidepools (Fitch 1973:106; Salls1988:558). Sixty-two species of rockfish are knownfrom the Pacific coast; most are fairly large and alsowould have been caught by line or net fishing.Together, rockfish and cabezon dominate all tem-poral components by considerable margins, repre-senting between 67 percent and 85 percent of NISP.The density of fish bone/m3 in the midden showeda gradual increase through most of the Holocene,reaching a peak value of 123.9 bones/m3 during theMiddle Period (component III) and decreasingslightly thereafter to 98.9 bones/m3 (Table 8).
Not surprisingly, the micro-samples (processedwith 1 mm mesh) reported by Fitch (1972) showgreater representation of smaller taxa and dramati-cally higher volumetric concentrations of fish bone(Table 11). He also identified a wider range of taxa(45 taxonomic classes). The majority (N = 10,834)of his sample of 12,165 elements was unidentifi-able. Among the identifiable specimens, surfperches(Embiotocidae) dominated all temporal componentsaccounting for 32.6 percent of the component I sam-ple (NISP = 43),41.7 percent of component II (NISP= 271), 34.1 percent of component III (NISP = 703),
and 33.8 percent of component IV (NISP = 314).Other important taxa were wolf-eel (Anarrhichthysocellatus; NISP = 9), that accounted for 20.9 per-cent of component IV; 16.6 percent of componentIII, but only 8.1 percent and 1.6 percent of the earlyHolocene components. In sharp contrast with the 6mm sample, the micro-sample shows an increase inexploitation of rockfish through the Holocene.Northern anchovies (Engraulis mordax) were alsoof some importance (ca. 14 percent) among the twolate Holocene components. Both surfperches andanchovies are most suited for capture by nets (Love1996; Salls 1988). Fitch (1973:108) felt that theanchovy bones in the SLO-2 midden most likelyarrived via the stomach content of larger fish andmarine mammals, and that site inhabitants did notuse nets, but he was apparently unaware that thesite’s artifact collection contains grooved stones thatare commonly interpreted as net sinkers. The con-tribution of stomach contents to the midden deposit,however, helps explain the remarkably high volu-metric concentration of fish bone reported in Fitch’sstudy. Relying on a microscope to complete iden-tifications, he documented over 13,000 fish bonesand bone fragments/m3 in the basal component ofCA-SLO-2 and an increase to a peak of over 86,000bones/m3 in the Middle Period component (Table7). This relative trend parallels the findings from thelarger mesh excavation units that also show an apexin density during the Middle Period. Fishing clearlyincreased over time at Diablo Canyon from 8300cal B.C. through cal A.D. 1000, but declined after-wards between cal A.D. 1500 and the time of con-tact.
Shellfish
Shell findings from the 1-x-1-m control columnwere reported in detail in the original site report(Greenwood 1972:49–51). As with most sites on
302 AMERICAN ANTIQUITY [Vol. 73, No. 2, 2008]
Table 9. Age Distribution of Black-tailed Deer (Odocoileus hemionus) from CA-SLO-2.
Late Period Middle Period Late Millingstone Early Millingstone(Component IV) (Component III) (Component II) (Component I) Total
NISP % NISP % NISP % NISP % NISP
Adult 147 85 342 82 90 80 6 86 587Juvenile 17 10 44 11 13 12 1 14 75Juvenile 0 0 6 1 2 2 0 0 8
(neonate or fetal)Sub-adult 9 5 26 6 8 7 0 0 43Total 173 100 418 100 113 100 7 100 714
AQ73(2) Jones 4/9/08 9:24 PM Page 302
REPORTS 303Ta
ble
10. F
ish
Rem
ains
fro
m C
A-S
LO
-2 (
6 m
m m
esh)
iden
tified
to th
e G
enus
Lev
el o
r B
ette
r.
IVII
III
ITo
tal
Taxo
nC
omm
on n
ame
NIS
P%
NIS
P%
NIS
P%
NIS
P%
NIS
P%
Ela
smob
ranc
hiom
orph
iSh
arks
,ska
tes,
rays
0.0
05
.13
1.2
70
.00
6.1
0C
arch
arhi
nida
eR
equi
em s
hark
s12
.66
33.8
616
4.35
12.
7862
1.02
Squa
ntin
a ca
lifo
rnic
aA
ngel
sha
rk0
.00
1.0
30
.00
0.0
01
.02
Rhi
noba
tis
prod
uctu
s Sh
ovel
nose
gui
tarfi
sh2
.11
1.0
31
.27
0.0
04
.07
Raj
ifor
mes
Skat
es2
.11
2.0
51
.27
0.0
05
.08
Myl
ioba
tis
cali
forn
ica
Bat
ray
0.0
02
.05
0.0
00
.00
2.0
3C
lupe
idae
Her
ring
s0
.00
10.2
60
.00
0.0
010
.16
Sard
inop
s sa
gax
Paci
fic s
ardi
ne0
.00
1.0
30
.00
0.0
01
.02
Mer
lucc
ius
prod
uctu
sPa
cific
hak
e7
.39
18.4
70
.00
0.0
025
.41
Pori
chth
ys s
p.Sp
eckl
efin,
or p
lain
fin m
idsh
ipm
an0
.00
13.3
43
.82
12.
7817
.28
Ath
erin
idae
Silv
ersi
des
0.0
01
.03
0.0
00
.00
1.0
2Se
bast
essp
.R
ockfi
shes
961
53.0
617
3344
.95
8823
.91
616
.67
2,78
845
.93
Hex
agra
mm
ossp
.K
elp
or r
ock
gree
nlin
g12
.66
30.7
82
.54
0.0
044
.72
Oph
iodo
n el
onga
tus
Lin
gcod
472.
6012
83.
3219
5.16
616
.67
200
3.29
Scor
paen
icht
hys
Cab
ezon
587
32.4
113
7235
.59
199
54.0
818
5.00
2,17
635
.85
mar
mor
atus
Seri
ola
lala
ndi
Yel
low
tail
1.0
60
.00
0.0
00
.00
1.0
2G
enyo
nem
us l
inea
tus
Whi
te c
roak
er0
.00
3.0
80
.00
0.0
03
.05
Em
biot
ocid
aeSu
rfpe
rche
s41
2.26
166
4.31
164.
352
5.56
225
3.71
Am
phis
tich
ussp
.B
arre
d,ca
lico,
or r
edta
il su
rfpe
rch
1.0
60
.00
0.0
00
.00
1.0
2E
mbi
otoc
a sp
.B
lack
per
ch,o
r st
ripe
d se
aper
ch0
.00
3.0
81
.27
0.0
04
.07
Rha
coch
ilus
sp.
Rub
berl
ip s
eape
rch,
or p
ile p
erch
0.0
02
.05
0.0
00
.00
2.0
3R
haco
chil
us t
oxot
esR
ubbe
rlip
sea
perc
h0
.00
2.0
50
.00
0.0
02
.03
Rha
coch
ilus
vac
caPi
le p
erch
6.3
36
.16
1.2
70
.00
13.2
1Sp
hyra
ena
arge
ntea
Paci
fic b
arra
cuda
0.0
01
.03
0.0
00
.00
1.0
2O
xyju
lis
cali
forn
ica
Seño
rita
0.0
00
.00
0.0
00
.00
0.0
0St
icha
eida
ePr
ickl
ebac
ks96
5.30
244
6.33
164.
351
2.78
357
5.88
Ceb
idic
hthy
s vi
olac
eus
Mon
keyf
ace
pric
kleb
ack
7.3
96
.16
0.0
00
.00
13.2
1X
iphi
ster
sp.
Roc
k or
kel
p pr
ickl
ebac
k29
1.60
711.
843
.82
12.
7810
41.
71Sc
ombr
idae
M
acke
rels
0.0
01
.03
0.0
00
.00
1.0
2M
ola
mol
aO
cean
sun
fish
0.0
00
.00
1.2
70
.00
1.0
2To
tal
1,81
110
.00
3,85
510
.00
368
10.0
036
10.0
06,
070
10.0
0
AQ73(2) Jones 4/9/08 9:24 PM Page 303
304 AMERICAN ANTIQUITY [Vol. 73, No. 2, 2008]Ta
ble
11. S
umm
ary
of F
ish
Bon
e Id
entifi
catio
ns f
rom
.25
x .2
5 m
Col
umn
Sam
ple
(1 m
m m
esh)
fro
m C
A-S
LO
-2 (
from
Fitc
h 19
72).
Lat
e P
erio
dM
iddl
e P
erio
dL
ate
Mil
ling
ston
eE
arly
Mil
ling
ston
e(C
ompo
nent
IV
)(C
ompo
nent
III
)(C
ompo
nent
II)
(Com
pone
nt I
)
Taxo
nC
omm
on N
ame
NIS
P%
NIS
P%
NIS
P%
NIS
P%
Tota
l
Ana
rrhi
chth
ys o
cell
atus
Wol
f-ee
l5
1.6
578.
145
16.6
92.
911
6E
mbi
otoc
ides
Surf
perc
h10
633
.824
034
.111
341
.714
32.6
473
Eng
raul
is m
orda
xN
orth
ern
anch
ovy
4414
.010
414
.827
9.9
12.
317
6Se
bast
essp
p.R
ockfi
shes
9831
.287
12.4
248.
95
11.6
214
Oth
er61
19.4
215
3.6
6222
.914
32.6
352
Subt
otal
314
100.
070
310
0.0
271
100.
043
100.
01,
331
Uni
dent
ified
Uni
dent
ified
3,24
463
3510
8317
210
,834
Gra
nd t
otal
3,55
870
3813
5421
512
,165
Tabl
e 12
. She
ll W
eigh
ts (
3 m
m m
esh)
fro
m 1
-x-1
-m C
olum
n Sa
mpl
e,C
A-S
LO
-2 (
from
Gre
enw
ood
1972
).
Com
pone
nt I
VC
ompo
nent
III
Com
pone
nt I
IC
ompo
nent
I(0
-70
cm; .
175
m3 )
(70-
200
cm; 1
.3 m
3 )(2
00-2
80 c
m; .
8 m
3 )(2
80-3
40 c
m; .
6 m
3 )
Shel
l Sh
ell
Shel
l Sh
ell
Tota
l She
llTa
xon
Com
mon
Nam
e%
wei
ght
(kg)
%W
eigh
t (k
g)%
wei
ght
(kg)
%W
eigh
t (k
g)W
eigh
t (k
g)
Myt
ilus
cal
ifor
nian
usC
alif
orni
a se
a m
usse
l72
.715
9.8
84.3
399.
888
.126
7.6
88.3
138.
215
9.8
Hal
ioti
s ru
fesc
ens
Red
aba
lone
11.6
25.5
29.
51.
95.
8.4
.625
.5H
alio
tis
crac
hero
dii
Bla
ck a
balo
ne1.
63.
5.5
2.4
**
.1.2
3.5
Hal
ioti
ssp
.A
balo
ne.2
.4.1
.5.1
.3.1
.2.4
Tegu
lasp
p.T
urba
n sn
ails
8.2
17.9
7.6
36.0
3.8
11.5
3.8
5.9
17.9
Bal
anus
sp.
Bar
nacl
es3.
27.
02.
813
.32.
88.
52.
43.
87
Stro
ngyl
ocen
trot
us p
urpu
ratu
sPu
rple
sea
urc
hin
.1.2
.1.5
**
*.0
.2O
ther
2.4
5.5
2.6
12.2
3.3
1.7
4.9
7.6
5.5
Tota
l10
.021
9.8
100
474.
210
030
4.4
100
156.
521
9.8
*Tra
ce
AQ73(2) Jones 4/9/08 9:24 PM Page 304
the open coast of central California, the depositwas dominated by the remains of species commonto the high energy, exposed rocky habitats foundnear Diablo Canyon today: California mussels(Mytilus californianus), turban snails (Tegula spp.),abalone (Haliotis spp.), and limpets (Collisella sp.).Mussels dominate component I (88.3 percent) andall later components, decreasing slightly to 72.7percent in component IV (Table 12). Continuity ofthis basic open coast assemblage speaks to the sta-bility of Diablo Canyon intertidal environmentsthrough the Holocene. This contrasts significantlywith the estuaries and islands of the California coastthat show taxonomic variation in shellfish relatedto sediment accumulation and changes in sea sur-face temperatures (see Glassow et al. 1994; Ken-nett 2005; Kennett and Kennett 2000, amongothers). Sea surface temperatures along the Diablocoast are influenced primarily by the cold,southward-flowing California Current. The south-ern California islands, in contrast, are influencedby multiple eddying currents, including the south-ern California Countercurrent (Browne 1994).Shifts in the flow of these currents and eddies hasno doubt contributed substantially to the much her-alded variability in sea surface temperature aroundthe islands (e.g.,Arnold 1992a; Glassow et al. 1994;Kennett and Kennett 2000). The Diablo coast, incontrast, shows the influence of one cold, south-ward flowing current over time. While the Cali-fornia Current is influenced by ENSO events andthere is also some evidence for longer-term vari-ability in SST along the open coast of central Cal-ifornia (Jones and Kennett 1999), such variationwas clearly less dramatic than that around theislands. In general, the limited taxonomic variationin the Diablo shell remains suggests relative sta-bility of littoral and nearshore habitats through theHolocene.
Some change through time was noted in thedensity of shell/m,3 which showed a peak value of379.7kg/m3 during the Late Millingstone (compo-nent II), declining slightly thereafter (Table 7).More importantly, the ratio of shell:deer boneweight declined from the early to late Holocenewith a peak value in component I of 13.0 to a lowof 5.3 in component III. This suggests that shell-fish were of greater dietary importance to earlyHolocene foragers which has been demonstratedrepeatedly in California before (e.g., Erlandson
1994; Erlandson et al. 2005; Jones 1992, 2003;Porcasi 2008). A similar progression is evident inthe ratio of shell:fish bone weight, suggesting thatfish also increased in dietary importance relative toshellfish through the Holocene (Table 7). Theabsolute percentage values of shellfish versus deerand fish in the actual diet of site inhabitants is amore complicated if not irresolvable issue sincerecent studies have shown that different approachesto dietary reconstruction yield vastly differentresults (cf. Glassow 2000; Mason et al. 1998). Forour purposes, we are content to identify the rela-tive trend over time, but we also note that toolassemblages with hundreds of bifaces and projec-tile points are probably not consistent with a dietcomposed mostly of shellfish. The only otherchanges through time in the shellfish remains aremodest increases in abalone (Haliotis spp.) and tur-ban snails (Tegula spp.) (Table 12). California mus-sels that decrease during this same period generallyoccur higher in the intertidal zone than do abalone,which suggests that foragers were collecting fromprogressively deeper habitats over the course of theHolocene. This is further supported by models ofdifferential processing, which suggest that, all elsebeing equal, as travel time to a foraging patchincreases, shellfish species with lower ratios ofmeat to shell (e.g., Mytilus) should be preferentiallyprocessed in the field before those species with lowratios (e.g., Haliotis) (Bird et al. 2002). The mod-est increase in low-ranked, labor-intensive turbansnails through the Holocene is consistent withincremental labor intensification.
Summary I: Early Holocene Lifeways
The basal component at CA-SLO-2 conflicts atleast partially with recent generalizations aboutearly foraging practices in western North Amer-ica that emphasize a lack of large game (e.g.,Erlandson 1994; Hildebrandt and McGuire 2002;Jones et al. 2002; Rick et al. 2001). As with all ofthe oldest mainland coastal sites (dating between8300 and 7000 cal. B.C.) in California, CA-SLO-2 postdates megafaunal extinctions, so the absenceof those large taxa is readily understandable. Like-wise, the southern California islands, which haveyielded the oldest radiocarbon evidence for humanoccupation in the northeastern Pacific (ca. 9700 calB.C.), had no populations of large terrestrial mam-
REPORTS 305
AQ73(2) Jones 4/9/08 9:24 PM Page 305
306 AMERICAN ANTIQUITY [Vol. 73, No. 2, 2008]Ta
ble
13. E
stim
ated
Ret
urn
Rat
es f
or R
esou
rces
Rep
rese
nted
at D
iabl
o C
anyo
n an
d Si
mila
r Sp
ecie
s.
Ret
urn
Rat
e (k
cal/h
r.)
Res
ourc
eTa
xon
Acq
uisi
tion
Met
hod
Low
Mea
nH
igh
Ref
eren
ce
Dee
r O
doco
ileu
s he
mio
nus
Enc
ount
er H
untin
g17
,971
24,7
1031
,450
Sim
ms
(198
7)Ja
ckra
bbit
Lep
us c
alif
orni
cus
Enc
ount
er H
untin
g13
,475
14,4
3815
,400
Sim
ms
(198
7)R
inge
d se
alP
hoca
his
pida
Enc
ount
er H
untin
g10
,550
11,7
8013
,010
Smith
(19
91)
Cot
tont
ail R
abbi
tSy
lvil
agus
sp.
Enc
ount
er H
untin
g8,
983
9392
9,80
0Si
mm
s (1
987)
Can
adia
n go
ose
Bra
nta
cana
dens
isC
anoe
-4,
930
-Sm
ith (
1991
)Sa
rdin
e,he
rrin
gs,s
choo
ling
fry
-N
ettin
g-
3806
-B
liege
Bir
d an
d B
ird
(199
7)C
anad
ian
goos
eB
rant
a ca
nade
nsis
Blin
d-
3,46
0-
Smith
(19
91)
Wat
erfo
wl
-E
ncou
nter
Hun
ting
-30
00-
Win
terh
alde
r (1
981)
Bla
ck-t
aile
d ja
ckra
bbit
Lep
us c
alif
orni
cus
Tra
ppin
g1,
495
2656
-U
gan
(200
5)Ja
ckra
bbit
Lep
us c
alif
orni
cus
Dri
ve62
824
364,
243
Sim
ms
(198
5)D
ucks
Ana
ssp
.E
ncou
nter
Hun
ting
1,97
523
422,
709
Sim
ms
(198
5)C
anad
ian
goos
eB
rant
a ca
nade
nsis
Enc
ount
er H
untin
g-
1,72
0-
Smith
(19
91)
Duc
ksA
natid
aeD
rive
dur
ing
mol
t56
193
91,
317
Sim
ms
(198
5)M
ed.-
Lar
ge b
otto
m-fi
sh,p
elag
ics
-H
andl
ine
(ree
f sl
ope)
-90
0-
Blie
ge B
ird
and
Bir
d (1
997)
Med
.-L
arge
car
nivo
rous
fish
-H
andl
ine
(bea
ch)
-90
0-
Blie
ge B
ird
and
Bir
d (1
997)
Smal
l fish
,oct
opus
,squ
id-
Spea
rfish
ing
(ree
f fla
t)-
600
-B
liege
Bir
d an
d B
ird
(199
7)C
alif
orni
a m
usse
lM
ytil
us c
alif
orni
anus
Pluc
king
543
559
574
Jone
s an
d R
ichm
an (
1995
)Sm
all c
arni
voro
us fi
sh-
Han
dlin
e (r
eef
flat)
-40
0-
Blie
ge B
ird
and
Bir
d (1
997)
Cal
ifor
nia
mus
sel
Myt
ilus
cal
ifor
nian
usSt
ripp
ing
214
330
446
Jone
s an
d R
ichm
an (
1995
)T
urba
n sn
ail
Tegu
la f
uneb
rali
sP
icki
ng73
Jone
s an
d F
erne
au (
2002
)
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mals, and human subsistence there alwaysincluded major contributions from shellfish andfish. The basal component at Diablo Canyon, how-ever, shows substantial evidence for the huntingof deer even though a nearby contemporaneous site(Cross Creek) and other coastal and peri-coastaldeposits (e.g., the Duncan’s Landing Rockshelterin northern California [Wake and Simons 2000])have produced few if any remains of large animals.With substantial quantities of deer in both the basaland late Millingstone components, CA-SLO-2shows that a focus on small game was by no meansa universal in western North America during theearly Holocene. Comparison of the relative fre-quencies of taxa represented at CA-SLO-2 withresource rankings based on experimental returnrates (Table 13) suggests that the high frequencyof deer remains is consistent with the potentialcaloric value of the resource, as long as the taxaare abundant enough to mitigate potential variancecaused by high search and pursuit failures, whichseems to have been the case at CA-SLO-2. Ofcourse, the high ranking of deer is contestedbecause of high variability in hunting success(Hildebrandt and McGuire 2002; McGuire andHildebrandt 2005), and does not explain theabsence of deer bone from the nearby Cross Creekand other sites. Nonetheless, the Diablo findingsshow that hunters took deer in greater numbersthan rabbits when deer were available, suggestingthat artiodactyls were relatively abundant withinthe site vicinity. The alternative that hunters weremainly targeting rabbits but settled for deer as afallback, or for social competition, seems implau-sible. Given the proclivity for deer hunting repre-sented at Diablo Canyon, we feel that the bestexplanation for the lack of deer bones from othersites is the absence of the species from many areasduring the early-mid Holocene as suggested byBroughton and Bayham (2003) and Byers andBroughton (2004); however, the Diablo dataclearly show that the supposed dearth of deer dur-ing the early Holocene was not universal acrossall of western North America, and this variabilityprobably reflects differences in the local ecologyas others have suggested (e.g., Hockett 2005;Zeanah 2004). Early Holocene foragers in west-ern North America were apparently confrontedwith a landscape in which the distribution of deerherds was uneven, which fostered varied inter-
regional emphasis on target species. At DiabloCanyon, a reliable population of deer provided aprimary target for hunting for nearly 10,000 years.
Of course, this does not mean that the earliestforagers at Diablo Canyon focused exclusively onthe terrestrial environment. The inhabitants of Dia-blo Canyon 9,000–10,000 years ago exploitedmarine birds (flightless and otherwise) as 37 per-cent of their large vertebrates and also pursuedsuch low-return activities as line fishing and shell-fish collection. Shellfish, of course, are a gatheredresource that might best be weighed against othergathered foods, most of which were floral not fau-nal. While ethnographic and experimentallyderived return rates for waterfowl are potentiallylow, data from Smith (1991; see Table 13) indicatethat return rates are considerably higher when thebirds are hunted from boats. Moreover, flightlessducks that were probably adapted to predator-freeislands and offshore rocks would certainly haveconstituted an attractive prey item. It is possiblethat this resource was so attractive that it encour-aged terrestrially based mainland foragers todevelop watercraft, but the pursuit of other marinebirds, line-fishing, and shellfish collection repre-sented in the basal component at Diablo Canyonseem more consistent with populations alreadyintensely adapted to the linear interface betweensea and land represented by the coastline of thenortheastern Pacific (e.g., people with boats).Erlandson et al. (2007) have emphasized theimportance of kelp forests along this interface, butthe Diablo finds suggest that these people were alsointerested in terrestrial game in land habitats adja-cent to the sea. This is probably due to the highdensity of deer in the site vicinity (e.g., in the adja-cent Irish Hills). As their exploitative activitiesbrought them further inland, these early popula-tions encountered areas lacking deer and appar-ently shifted their attention to more plentifulsmaller animals. In this instance, optimal foragingtheory exposes behavior that can only be under-stood by recognizing historical contingenciesrelated to coastal colonization (e.g., boating tech-nology) and particulars of the local environment(e.g., deer abundance). While archaeological appli-cations of behavioral ecological models oftenignore these local variables (despite their explicitimportance in most models), the Diablo case sug-gests that this approach is untenable.
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Summary II: EconomicIntensification/Resource Suppression
Evidence for change through time at DiabloCanyon is generally of a more muted character thanthe dramatic variation often reported from the Cal-ifornia Islands. This modest variability is partiallya product of the coarse-grained or blurred charac-ter of the mainland record caused by bioturbation;however, the site’s shellfish and fish assemblagesalso indicate that nearshore environments were rel-atively stable through the Holocene and that envi-ronmental inducements to cultural change werelimited. Still, three types of diachronic variation areapparent: (1) modest incremental changes in vol-umetric densities, ratios, and percentages; (2) grad-ual but qualitatively and quantitatively significantchanges in certain taxa, including one (the flight-less duck) that was hunted into extinction; and (3)punctuated, multidirectional change during the lateHolocene.
Nearly all of the gradual but modest changes thatoccurred between ca. 8300 cal B.C. and cal A.D.1000 (components I through III) can be correlatedwith population growth reflected in the Diablo bur-ial record. Small, incremental increases in volu-metric density of fish bone correlate well with anoverall increase in diet breadth reflected by Mar-galef Index values (Figure 3). Through the courseof the Holocene, the Diablo foragers progressivelybroadened their diets at the same time they har-vested increasing quantities of fish. As Arnold etal. (2004:15) note, such small incremental changesdo not match the formal predictions of economicintensification (sensu Boserup 1965) in that theyimply no major reorganization of human labor, nordo they in themselves indicate resource suppres-sion. Indeed, they suggest a reliable resource basethat accommodated increasing harvesting pressureover most of the Holocene. Still, these changes arenot wholly insignificant either. Bone weight-basedratios show that shellfish became less important rel-ative to both deer and fish over time, highlightinga fundamental difference in shellfish vs. fish inpotential to contribute to economies affected bypopulation growth; while shellfish became rela-tively less important in the overall diet, fishincreased in both absolute and relative importance.The overall decrease in dietary evenness throughthe Holocene (Figure 3) seems to reflect the emer-
gence of a modest specialization in fishing in thelate Holocene albeit one dramatically less intensivethan those of the Santa Barbara Channel Islands.This specialization is also apparent in the lateHolocene artifact assemblage (Table 4). We sug-gest that the qualitative increase in fishing throughthe Holocene represents a legitimate case of inten-sification, albeit a modest and gradual one.
Certain resources at Diablo Canyon exhibitmore significant diachronic variation, particularlythe flightless duck, sea otters, and abalone. Changesin the relative importance of these resources areecologically interrelated since the three specieswere all residents of littoral/nearshore marine habi-tats. The case of the flightless duck is particularlyimportant as it constitutes the only unequivocalcase in precontact North America of resource over-exploitation so extreme that it led to extinction.This highly vulnerable species that accounted for18.2 percent of the large vertebrate remains in com-ponent I decreased through the Holocene and is themain cause underlying an overall decrease inexploitation of marine birds. Radiocarbon datesfrom other sites indicate that the flightless duck wasextinct by ca. 500 cal B.C. (Morejohn 1976), whichcorrelates well with the patterning at DiabloCanyon. At the same time this taxon declined andexploitation of all marine birds decreased, sea ottersincreased in relative importance. Elsewhere, theinitial exploitation of otters as a presumably low-ranked resource (exploitable only with boats) hasbeen attributed to suppression of larger, more highlyranked pinnipeds (Hildebrandt and Jones 1992;Jones and Hildebrandt 1995). No such pattern isevident at Diablo Canyon where sea otters were theonly marine mammal exploited in significant num-bers. Rather, the more substantive decline of theflightless duck preceded the initial exploitation ofotters. This seems to reflect the replacement of oneprey item exploited by watercraft with another. Theincreased exploitation of abalone that parallels theincrease in otter bones through the Holocene mustbe partially a reflection of the reduction in otter pop-ulations (a major predator on abalone) as a resultof increased human predation. Although manyother factors (e.g., sea temperature variation, dis-eases) influence abalone populations, the likelyimpact of increased human predation on otters can-not be overlooked. Erlandson, Rick, Estes, Graham,Braje, and Vellanoweth (2005) and Braje et al.
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Figure 3. Diversity Indices from combined Bird, Mammal, and Fish (6 mm) remains from CA-SLO-2 compared withburial populations, shell:deer bone weight, and fish bone weight over time.
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(2007) have made similar observations on theChannel Islands. At Diablo Canyon, an apparentcoharvesting strategy ultimately yielded certainfood benefits for human populations. Over thecourse of the Holocene, foragers at Diablo Canyonsimultaneously helped wipe out one species whilethey reduced the population of a key nearshorepredator with whom they were in competition. Thenet result was greater absolute productivity—albeitin the form of more lower-ranked resources.3
The Diablo data also highlight the relativeimportance of large terrestrial mammals through-out the Holocene. Despite the predictions of some(e.g., Hildebrandt and McGuire 2002) and findingsfrom other sites on the California coastal margin(e.g., Cross Creek), the Diablo collection reflectsa local deer population abundant enough to sup-port sustained levels of exploitation and provide areliable and efficient resource for over 10,000 years.The Diablo case supports other recent studies (e.g.,Elston and Zeanah 2002; Hockett 2005; Zeanah2004) that highlight the importance of under-standing how local environmental factors directlyaffect the distribution of local fauna. The local
abundance of deer at Diablo Canyon, and theirinferred reliability suggest that artiodactyls wouldnot be the best target prey for males wishing to dis-tinguish themselves from others via costly signal-ing, as even lower-quality (or less-skilled) hunterswould be capable of obtaining deer in this situa-tion due to their ready availability—although itremains possible that individual hunters wereattempting to signal their ability to provision, whichis a possible signaling strategy (see Gintis et al.2001; Smith and Bliege Bird 2005). This form ofsignaling seems a greater match to the record at Dia-blo Canyon, suggesting that male hunters procuredlarge game with enough consistency that it waspart of a provisioning strategy in which foragersacquired these large terrestrial mammals efficientlythroughout the Holocene without measurablydepressing their populations.
The late Holocene provides the only substan-tive suggestion of environmentally induced cul-tural change in the Diablo record. Like many sitesin the region, CA-SLO-2 was abandoned duringmost of the Medieval Climatic Anomaly when thereis evidence for widespread droughts throughout
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Figure 4. Relative frequency of flightless duck (Chendytes lawi), sea otter (Enhydra lutris), and abalone (Haliotis spp.)remains from CA-SLO-2.
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much of western North America (Stine 1994); afterca. A.D. 1000, the site was occupied only from ca.cal A.D. 1500–1770. This relatively minor, post-drought occupation is reflected by reduced num-bers of artifacts and burials, and coincident declinesin shell and fish bone volumetric density. However,unlike most of the developments during the first9,000 years of the site’s occupation, there is lessoverall consistency in the directionality of faunalchange. Diet breadth and evenness, for example,converge for the first time (Figure 3). The most par-simonious explanations for the varied character ofthese late cultural changes are historical contin-gencies related to the Medieval droughts (Jones etal. 1999) and Protohistoric diseases (Erlandson andBartoy 1995; Preston 1996). In her original analy-sis of CA-SLO-2, Greenwood (1972) recognizedthat the most recent occupation was less intensivethan earlier ones and suggested that early historicdisruptions were the cause. Our analysis of thesite’s fauna leads to the same conclusion althoughwe envision Medieval drought as an additional dis-ruptive variable.
Discussion
CA-SLO-2 has produced one of the largest trans-Holocene faunal assemblages from the west coastof North America. The site’s basal component illu-minates an initial Holocene coastal adaptation inwhich foragers exploited a wide range of terrestrialand marine foods including deer, marine birds(especially the extinct flightless duck), rabbits,open-coast shellfish, and fish. While this subsis-tence mode is partially consistent with life “on thekelp highway” suggested by Erlandson et al. (2007)in that it almost certainly involved the use of water-craft, it also included heavy exploitation of terres-trial foods from land habitats adjacent tp the sea.The suite of resources exploited by Diablo’s earli-est residents can be seen as optimal only for a pop-ulation already invested in development ofwatercraft and who were intensely adapted to theinterface of land and sea along the coastline of thenortheastern Pacific. The heavy representation ofdeer in basal and later components at DiabloCanyon suggests that recent generalizations aboutan emphasis on small game by early Holocene for-agers (e.g., Hildebrandt and McGuire 2002) arepremature and that early colonists exploited larger
game when it was available. Uneven distributionof deer herds in western North America during theearly-middle Holocene probably explains therecovery of deer bones from some areas and notothers (Byers and Broughton 2004; Hockett 2005;Zenah 2004). The historical contingencies ofcoastal colonization and gradual, uneven post-Pleistocene expansion of deer populations follow-ing terminal Pleistocene megafauna extinctionsmay explain the dietary choices available to andmade by the earliest coastal inhabitants.
The Diablo record further includes unequivocalevidence of population growth in the site area inthe form of superimposed burial populations. Cor-related changes in faunal consumption patternsimply the influence of incremental populationgrowth although a basic, broad-spectrum mixedeconomy persisted throughout the Holocene. Witha stable marine environment influenced by onecold, southward-flowing current (the CaliforniaCurrent), Diablo Canyon shows relatively mutedvariation consistent with gradual diet broadening,and emergence of a very modest specialization innearshore fishing. There is no evidence for over-exploitation of pinnipeds or fish, and the impor-tance of the latter as the key resource thataccommodated population growth is clearlydemonstrated, raising questions about argumentsadvanced elsewhere (e.g., Broughton 1994a, 1999;Salls 1992) for prehistoric fish overexploitation.The site does show the only unequivocal case ofgradual overpredation leading to extinction inNorth America, although the flightless duck wasrendered extinct through the combined efforts offoraging groups all along the California and Ore-gon coasts not by the Diablo Canyon hunters alone.Disappearance of the species was followed by sig-nificant changes related to exploitation of a less vul-nerable, more elusive (and presumablylower-ranked) taxon, the sea otter. At the time ofhistoric contact when the final use of CA-SLO-2ended, the prevailing adaptation was slightly moreintensive than that of the early Holocene and therewas one less Native species present in the region.However, an overall broad-spectrum foraging strat-egy was still present.
Diachronic changes at Diablo Canyon are muchless dramatic than those on the southern Califor-nia Islands, partially due to more extreme vari-ability in marine environments off the islands as
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well as the exaggerated selective pressures thatoperate on human and animal populations in insu-lar situations. While the islands provide dramaticevidence for the same principles of foraging effi-ciency discussed here, the uniqueness of island cul-tural trajectories is also illuminated by comparisonwith the mainland. The effects of several of thesame historical contingencies are apparent in bothareas (e.g., coastal colonization, the Medieval Cli-matic Anomaly, protohistoric diseases), the main-land record illuminates foraging decisions made bygradually growing human population on a less cir-cumscribed, continental land mass.
Acknowledgments. We are deeply indebted to RobertaGreenwood for completing such a thorough investigation ofCA-SLO-2 in 1968. Her research at the site is still one of themost important studies in western North American archaeol-ogy. We would like to express our most sincere thanks toMike Cannon for his assistance in applying his model, and toDoug and Rebecca Bird for numerous informative discus-sions. We also thank Luther Bertrando and the San LuisObispo County Archaeological Society for allowing us towork with the Diablo faunal collection, Terry Joslin andValerie Levulett for discovering a last cache of lost bones,Jennifer Farquhar for sharing her radiocarbon findings withus, and Ken Gobalet for his assistance with the fish boneidentifications. Helpful comments on earlier drafts of themanuscript were provided by Roberta Greenwood and JonErlandson; we are indebted to both of them as well as to twoanonymous reviewers. Angela Barrios and Sarah Mellingerwere most helpful in compiling the Diablo data base.Funding for dating and analysis of faunal remains fromDiablo Canyon was provided by California Sea GrantR/CZ–187. Any mistakes in fact or judgment are strictly theresponsibility of the authors.
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Notes
1. One date, obtained by Greenwood (1972:4) from asample of human bone, yielded a calibrated age of 8770 calB.C., which is anomalously older than all other dates from thesite. Given the uncertainties about collagen extraction tech-niques used in 1972, it seems best to reject this date.
2. While researchers have argued over the specifics ofsuch utility indices in ethnographic situations (see reviews inMonahan 1998), treating these measures as qualitative mea-sures comparable between time periods has been shown toclarify archaeological situations of resource depression(Cannon 2003). This paper treats utility indices as relative,qualitative measures that are useful for comparison betweendifferent temporal components within a single site. Utilizedin this way, an increase in the proportion of high utilityremains deposited at the site indicates a decrease in the abun-dance of artiodactyls on the landscape. This is so because asthe relative abundance of artiodactyls decreases, foragers willhave to spend a greater amount of time in search and pursuit.As a consequence, they are more likely to be further awayfrom the central place, which would increase the payoff ofprocessing and culling artiodactyl parts that have low eco-nomic utility. A decrease in the proportion of high utilityremains indicates the opposite.
3. The ranking of sea otters is also complicated by thevalue of their pelts which were important trade items inNative California.
Submitted March 26, 2007; Accepted August 31, 2007.
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