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Amoco Prod. Co.#19-1 Milford Federal
Amoco Prod. Co.#1 Idaho State
4057
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22
4050
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4632
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5385
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4270
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4061
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2160
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5215
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932
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37
C A R M E NS T O C K
BIG E
IGHTM
ILE STOCK
P O I S O N
C R E E K
F A U L T
L E M
P E AK
FA U LT
SA
LM
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RIV
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FA
UL
T
BR
US
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G U L C H
FA
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F A U L T
44°30'44°30'
45°00' 45°00'
45°30' 45°30'
114°00'
114°00'
113°00'
113°00'
113°30'
113°30'
Base from U.S. Geological Survey, Borah Peak, 1989, Leadore, 1980, Salmon, 1981.
Projection: Universal Transverse Mercator, zone 12.
1927 North American Datum
See "Index to sources of geologic mapping"
Editing and digital cartography by Alessandro J. Donatich,
Central Publications Group
Manuscript approved for publication July 1, 2002
U.S. DEPARTMENT OF THE INTERIORU.S. GEOLOGICAL SURVEY
GEOLOGIC INVESTIGATIONS SERIESI–2765 (Sheet 2 of 2)Pamphlet accompanies map
Printed on recycled paper
Any use of trade names in this publication is fordescriptive purposes only and does not imply endorsement by the U.S. Geological Survey
For sale by U.S. Geological Survey Information ServicesBox 25286, Federal Center, Denver, CO 802251-888-ASK-USGS
ArcInfo coverages and a PDF for this map are available at http://pubs.usgs.gov/imap/2003/i-2765/
1 10 KILOMETERS0 1 2 43 5 6 7 8 9
SCALE 1:100 000
CONTOUR INTERVAL 50 METERS (BORAH PEAK, SALMON), 40 METERS (LEADORE)
1 8 MILES10 2 3 4 5 6 7
GEOLOGIC MAP OF THE SALMON NATIONAL FORESTAND VICINITY, EAST-CENTRAL IDAHO
Compiled byKarl V. Evans and Gregory N. Green
2003
Geologic Map of the Eastern Part of the Salmon National ForestBy
K.I. Lund, K.V. Evans, R.G. Tysdal, and G.R. Winkler
DESCRIPTION OF MAP UNITS
[Boxes colored only for units shown on this sheet]
SURFICIAL DEPOSITS
Alluvial, colluvial, landslide, and glacial deposits, undivided (Quaternary)
CENOZOIC SEDIMENTARY ROCKS
Gravel, limestone, sandstone, and volcaniclastic sediments (Holocene to Oligocene(?))
Tuff and tuffaceous conglomerate (Pliocene to Miocene)
Sedimentary rocks—basin fill (Miocene(?) to Eocene)
Older colluvium of Panther Creek (Eocene)
CENOZOIC VOLCANIC ROCKS
Challis Volcanic Group (Eocene)
Challis Volcanic Group, undivided
Tuffs and lavas of Thunder Mountain cauldron complex (southwestern part of Salmon National Forest)—See Fisher and others (1992)
Sunnyside tuff
Perlitic rhyolite
Lapilli tuff
Lower latite lava
Tuffs of Castle Rock segment of Van Horn Peak cauldron complex (southwestern part of Salmon National Forest)—See Ekren (1988)
Tuffs of Castle Rock
Tuffs of Camas Creek–Black Mountain and related rocks of Van Horn Peak cauldron complex (southwestern part of Salmon National Forest)—See Ekren (1988)
Tuffs of Camas Creek–Black Mountain
Intermediate and mafic lavas
Tuff of Eightmile Creek
Tuff of Ellis Creek
TERTIARY TO CRETACEOUS INTRUSIVE ROCKS
Mafic to felsic intrusions, undivided (Eocene)
Gray porphyry (Eocene)
Granite (Eocene)
Granite, granodiorite, and quartz monzodiorite (Eocene)
Intrusive rhyolite (Eocene)
Intrusions, mostly intermediate and felsic (Tertiary to Cretaceous)
Hornblende-biotite tonalite (Cretaceous)
Biotite-muscovite granite (Cretaceous)
Porphyritic granite and granodiorite (Cretaceous)
Biotite granodiorite (Cretaceous)
Foliated biotite granodiorite (Cretaceous)
MESOZOIC TO PROTEROZOIC SEDIMENTARY ROCKS
Dinwoody Formation (Lower Triassic)
Phosphoria Formation (Lower Permian)
Snaky Canyon (Lower Permian to Upper Mississippian) and Bluebird Mountain (Upper Mississippian) Formations, undivided
Surrett Canyon(?), South Creek(?), and Scott Peak Formations (Upper Mississippian) and Middle Canyon (Upper and Lower Mississippian) Formation, undivided
Surrett Canyon, South Creek, and Scott Peak Formations (Upper Mississippian) and Middle Canyon (Upper and Lower Mississippian) Formation, undivided
Railroad Canyon Formation (Upper Mississippian)
Scott Peak Formation (Upper Mississippian)
Middle Canyon Formation (Upper and Lower Mississippian)
McGowan Creek Formation (Lower Mississippian)
Three Forks and Jefferson Formations, undivided (Upper Devonian)
Laketown Dolomite (Silurian) and Saturday Mountain Formation (Lower Silurian to Middle Ordovician), undivided
Saturday Mountain Formation (Lower Silurian to Middle Ordovician)
Kinnikinic Quartzite (Middle Ordovician)
Summerhouse Formation (Lower Ordovician)
Kinnikinic Quartzite (Middle Ordovician) and Summerhouse Formation (Lower Ordovician), undivided
Wilbert Formation (Lower Cambrian to Neoproterozoic?)
PALEOZOIC TO PROTEROZOIC VOLCANIC ROCKS
Metavolcanic and metasedimentary strata (lower Paleozoic(?) to Neoproterozoic)
PALEOZOIC INTRUSIVE ROCKS
Mafic to predominantly felsic alkalic intrusions (Ordovician to Cambrian)
PALEOZOIC TO PROTEROZOIC METAMORPHIC ROCKS
Gray marble (lower Paleozoic(?) to Neoproterozoic)
PROTEROZOIC SEDIMENTARY ROCKS
Lawson Creek Formation (Mesoproterozoic)
Swauger Formation (Mesoproterozoic)
Gunsight Formation (Mesoproterozoic)
Apple Creek Formation, undivided (Mesoproterozoic)
Banded siltite unit
Coarse siltite unit
Diamictite unit
Fine siltite unit
Big Creek Formation (Mesoproterozoic)
Lawson Creek Formation, Swauger Formation, and (or) Lemhi Group, undivided (Mesoproterozoic)
Argillaceous quartzite, unnamed (Mesoproterozoic)
Hoodoo Quartzite (Mesoproterozoic)
Yellowjacket Formation (Mesoproterozoic)
Feldspathic metasandstone (Mesoproterozoic)
Missoula Group, undivided (Mesoproterozoic)
Helena and Empire Formations, undivided (Mesoproterozoic)
Spokane and Greyson Formations, undivided (Mesoproterozoic)
PROTEROZOIC INTRUSIVE ROCKS
Mafic intrusive rock (Neoproterozoic?)
Megacrystic granite and augen gneiss (Mesoproterozoic)
Amphibolite and magnetite-hornblende gneiss (Mesoproterozoic)
PROTEROZOIC METAMORPHIC ROCKS
Biotite gneiss (Mesoproterozoic)
Quartzite (Mesoproterozoic)
Calc-silicate quartzite (Mesoproterozoic)
Basement gneiss (Paleoproterozoic)
Contact—Dashed where approximately located; queried where uncertain. Scratch boundaries used where contacts omitted along lats 44°30' N. and 45° N.
Strike-slip fault—Dashed where approximately located; dotted where concealed. Opposed arrows show relative movement
Normal fault—Dashed where approximately located; dotted where concealed; queried where uncertain. Bar and ball on downthrown side
Thrust fault—Dashed where approximately located; dotted where concealed; queried where uncertain. Sawteeth on upper plate
Low-angle normal fault—Dashed where approximately located; dotted where concealed. Box on upper plate
Thrust fault with later normal movement—Dashed where approximately located; dotted where concealed. Sawteeth on upper plate; bar and ball on downthrown side
Thrust fault with younger-on-older relationship and multiple-stage development—Dashed where approximately located; dotted where concealed. Sawteeth on upper plate. Younger-on-older relationship may be caused by multiple phases of compressional deformation and (or) by decoupling in lower plate during thrust juxtaposition. Superposed brittle deformation by low-angle normal movement
Anticline—Dotted where concealed
Syncline
Overturned anticline—Dotted where concealed
Overturned syncline—Dotted where concealed
Caldera margin
Dikes of unknown age or chemistry
Strike and dip of bedding
Inclined
Overturned
Strike and dip of silicified breccia-zone and cataclasite surface east of Baker and Lemhi, and west of Tendoy, Idaho
Strike and dip of inclined foliation
Bearing and plunge of lineation—May be combined with foliation symbol
Drill hole
Area in which stratigraphic unit occurs at a higher-than-typical metamorphic grade
Brittlely deformed and silicified breccia and cataclasite—Formed along low-angle normal faults during Tertiary regional extension (Tucker, 1983; Janecke and others, 1999). Locally preserved as an erosional remnant forming dip slopes on several ridge spurs on west side of northern Beaverhead Mountains, on top of Ramsay Mountain, and near McDevitt Creek in Lemhi Range. Along Kenney Creek a highly polished, reddish, hematitic, silicified surface of ultracataclasite dips 8° NW. and truncates east-dipping hanging wall of Eocene to Miocene(?) sedimentary strata that intersect the surface at an angle of 60°. Below surface, brecciation is intense but gradually decreases to unbrecciated Proterozoic strata through a 50-m-thick transition zone. The same fault(s) that formed the cataclasite in Beaverhead Mountains has probably been intersected at depth in exploration drill holes at the Humbug gold prospect along Ditch Creek northwest of outpost of North Fork
85
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20
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PMs
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Ms
Mm
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Ys
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SURFICIALDEPOSITS
SEDIMENTARY ROCKS VOLCANIC ROCKS INTRUSIVE ROCKS METAMORPHIC ROCKS
CORRELATION OF MAP UNITS
Holoceneand
Pleistocene
LowerTriassic
LowerPermian
UpperMississippian
LowerMississippian
LowerSilurian
UpperOrdovician
MiddleOrdovician
LowerOrdovician
Lower Cambrian
UpperDevonian
Pliocene
Miocene
Oligocene
Eocene
QUATERNARY
TERTIARY
CRETACEOUS
TRIASSIC
PERMIAN
PENNSYLVANIAN
MISSISSIPPIAN
DEVONIAN
SILURIAN
ORDOVICIAN
CAMBRIAN
NEOPROTEROZOIC
MESOPROTEROZOIC
PALEOPROTEROZOIC
?
?
?
?
?
Thunder Mountaincauldron complex
CastleRock
Camas Creek–Black Mountain
Unconformity
Unconformity
Unconformity
Unconformity
Unconformity
Unconformity
Unconformity
Unconformity
Unconformity
Unconformity Unconformity
Rel
ativ
e ag
eun
know
n
Rel
ativ
e ag
eun
know
n
Rel
ativ
e ag
eun
know
n
Rel
ativ
e ag
eve
ry a
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xim
ate
Lemhi Group
?
?
114°30' 114°00' 113°30'
45°30'
45°00'
44°30'
Anderson (1959)
Anderson (1961)
Bennett (1977)
Cater and others (1973)
Connor (1990)
Connor and Evans (1986)
Desmarais (1983)
Ekren (1988)
Evans (1981)
Evans and Connor (1993)
Hait (1965)
Hillesland (1981)
Kaiser (1956)
Lopez (1982a)
Lopez (1982b)
Lucchitta (1966)
Lund, Evans, and Esparza (1983)
Lund, Rehn, and Holloway (1983)
Lund and others (1992)
Maley (1974)
M’Gonigle (1994)
Rember and Bennett (1979)
Ruppel (1968)
Ruppel (1980)
Ruppel and Lopez (1981)
Ruppel and others (1993)
Schmidt and others (1994)
Shockey (1957)
Skipp and others (1984)
Spence (1984)
Staatz (1973)
Staatz (1979)
Tucker (1975)
Tysdal (1996a)
Tysdal (1996b)
Tysdal (1996c)
Tysdal (2000b, 2003)
Tysdal (2002)
Tysdal and Desborough (1997)
Tysdal and others (2000)
Tysdal and Moye (1996)
Unpublished mapping, K.V. Evans, USGS, 1995–97
Unpublished mapping, K.V. Evans, USGS, 1993–97
Unpublished mapping, K.V. Evans, F. Moye, and R.F. Hardyman, USGS, 1991–94
Unpublished mapping, K.I. Lund, USGS, 1995–2000
Unpublished mapping, G.R. Winkler, USGS, 1995–97, and R.G. Tysdal, USGS, 1999–2001
Unpublished mapping, G.R. Winkler, USGS, 1994–96
Unpublished mapping, K.I. Lund, USGS, 1997
Unpublished mapping, R.G. Tysdal, USGS, 1997–99
Unpublished mapping, R.G. Tysdal and K. Lund, USGS, 1997–99
Unpublished mapping, R.G. Tysdal, USGS, 1996–98
Unpublished mapping, R.G. Tysdal, USGS, 1998–2000
Unpublished mapping, K.I. Lund, USGS, 2000–01
SOURCES OF GEOLOGIC MAPPING
INDEX TO SOURCES OF GEOLOGIC MAPPING
Salmon National Forest
EXPLANATION
1
2
3
4
5
6
7
8
9
10
11
12
30
31
32
33
34
35
36
40
41
42
43
44
45
46
47
28
48
38
49
50
51
39
37
52
53
13
14
15
16
17
18
19
21
20
22
23
24
25
26
27
29
19
4 27
18
173
12
1330
1542
114
7
2622
43
10
40
8
5
39
9 33
46
4144
3447
37
51
52
32
452
38
5049
24 2325
11, 48
35
36
31 21
16
29
6, 28
53
20