Mountain View Geologic Map - Arkansas View.pdfDatum is mean sea level ... time it was created. As...
1
Cane Hill Imo interval Mississippian 0 ft 100 200 300 400 500 600 700 800 900 1000 1100 1200 0 m 100 200 300 1300 400 1400 1500 Pennsylvanian Osagean Chesterian Meramecian System Series Morrowan Stratigraphic Column Formation Member Silurian Ordovician Batesville Sandstone Moorefield Boone Fayetteville Shale Pitkin Limestone Hale Silurian Undifferentiated Fernvale Limestone limestone sandstone shale limestone and chert unconformable surface shale with siltstone shale with sandstone calcareous shale ripple-bedded sandstone and shale Arkansas Geological Survey Bekki White, State Geologist and Director Geologic Map of the Mountain View Quadrangle, Stone County, Arkansas Richard S. Hutto and Daniel S. Rains 2013 Digital Geologic Quadrangle Map Mountain View Quadrangle, Arkansas DGM-AR-00604 0 46’ Approximate mean declination 2013 The topographic base is a Digital Raster Graphic (DRG). The DRG is a scanned image of a U.S. Geological Survey standard series topographic map published in 1969. Some of the colors of the original map have been modified and it is displayed at 40% transparency. Polyconic projection. 1927 North American Datum. 10,000-foot grid based on Arkansas coordinate system, north zone. (Lambert Conformal Conic). 100-meter Universal Transverse Mercator grid ticks, zone 15 shown in blue. Light duty road Unimproved road Secondary highway Road Classification State Route Geologic Cross Section A - A’ Scale: Horizontal: 1 inch = 2000 feet Vertical: 1 inch = 500 feet (4X exaggeration) Contour Interval 20 Feet Datum is mean sea level Map and cross-section digitized by Nathan Taylor. Acknowledgments: This map was produced for The National Cooperative Geologic Mapping Program (STATEMAP), a matching-funds grant program administered by the U.S. Geological Survey, under Cooperative Agreement Award G12AC20224. Special thanks to the private landowners who graciously allowed access to their properties. Very special thanks to Angela Chandler for her tireless dedication to this mapping project. Limitations: This map, like all geologic maps, is based on interpretations which were made from the data available at the time it was created. As work continues and new data is collected, the contacts and structures depicted on this map may be changed. For the latest edition of this and other AGS maps and publications, please call Publication Sales at 501-296-1877, or visit the Vardelle Parham Geology Center, 3815 West Roosevelt Road, Little Rock, Arkansas 72204. This map is also available on our website in Portable Document Format at http://www.geology.ar.gov/geologic_maps/dgm24k.htm Suggested citation for this map: Hutto, Richard S., and Rains, Daniel S., 2013, Geologic map of the Mountain View quadrangle, Stone County, Arkansas: Arkansas Geological Survey, Digital Geologic Map, DGM-00604, 1 sheet 1:24,000. Cane Hill Imo shale QUADRANGLE LOCATION ARKANSAS Mb Boone Formation (Lower Mississippian, Osagean) - Typically consists of thick-bedded, finely granular to coarsely bioclastic limestone interbedded with chert nodules and anastomosing chert beds. The limestone is usually medium- to dark-gray on fresh surfaces and light-gray after weathering; common fossils include crinoids and brachiopods, though others have been noted (McFarland, 2004); pyrite crystals are rare. The chert is commonly white to gray on fresh and weathered surfaces, but weathers tan locally. Land surfaces developed in the Boone Formation are characterized by rolling hills with abundant sinkholes and springs, covered by unconsolidated regolith composed primarily of red clay and chert gravel. The St. Joe Member is poorly exposed or absent. Where present, it consists of approximately 3 feet (1 meter) of bioclastic, coarse-grained limestone. Its position near the base, and the absence of chert distinguish it from the upper Boone Formation. Locally there is a calcareous tannish-gray to gray, fine- to medium-grained sandstone that contains siltstone and quartz pebbles and is typically less than 1 foot (.5 meter) thick at the base of the St. Joe Member. Unconformable with the underlying Lafferty Limestone. The formation is 220 - 280 feet (67 - 85 meters) thick. Fernvale Limestone (Upper Ordovician) – Coarsely bioclastic limestone. Pink to white to gray on freshly broken surfaces. Usually rounded, friable, moss-covered, and gray to white on weathered surfaces. Minor blueish-green shale sections and partings are rare. Locally contains 1 millimeter euhedral pyrite crystals. Up to 20 feet (9 meters) thick. Of Su Silurian rocks (undifferentiated) – Mostly very finely granular to micritic limestone of the Lafferty Limestone. Medium-gray with dark-red blebs on freshly broken surfaces and medium-gray on weathered surfaces. Thin- to medium-bedded and flat-bedded. Rare calcite veins. Some coarsely crystalline limestone and gray calcareous shale are present in one location which may represent Brassfield Limestone and or Ordovician Cason Shale. Unconformable with the underlying Fernvale Limestone. 25 - 30 feet (8 - 9 meters) thick. Mpi Mp Pitkin Limestone (Upper Mississippian, Chesterian) – Mostly thick-bedded, very finely to coarsely crystalline bioclastic limestone with lesser intervals of shale containing thin, slightly calcareous siltstone interbeds. The limestone is usually light- to medium-gray on freshly broken surfaces and gray after weathering; contains abundant fossil fragments including crinoid stems and Archimedes; locally oolitic and cross bedded. The shale and siltstone is black when freshly broken and buff on weathered surfaces. Well-developed nearly orthogonal joint-sets produce rectangular to rhombic siltstone float where the shale and siltstone intervals are weathering at the surface. Conformable with the underlying Fayetteville Shale. 140 – 400 feet (43 – 122 meters) thick. Imo interval (Upper Mississippian, Chesterian) – Typically consists of thin- to thick-bedded sandstone intervals interbedded with shale. Sandstone is mostly very fine grained, buff to tan on fresh surfaces, and weathers to brown or grayish-brown; displays well-developed, abundant stylolitic surfaces, and well-preserved plant fossils including Calamites, Lepidodendron, and Stigmaria; contains coal traces; cross bedded sections are common throughout; honeycomb structure is a common development, and liesegang banding and soft-sediment deformation are preserved locally. The shale is mostly black on fresh surfaces, but locally gray; charcoal-gray to tan on weathered surfaces; contains poorly exposed fossiliferous zones with fragments of brachiopods, ammonoids, nautiloids, crinoids, gastropods, and rugosans. Locally there are flat gypsum laminae less than a quarter inch (6 millimeter) thick, limestone lenses typically no more than two feet (0.6 meter) thick, and fossiliferous conglomerate lenses up to three feet (1 meter) thick containing ferruginous pebble-size concretions. Conformable with the underlying Pitkin Limestone. 180 - 400 feet (55 - 122 meters) thick. Mf Fayetteville Shale (Upper Mississippian, Chesterian) – Primarily composed of shale with interbedded micrite. The shale is black when freshly broken, dark-gray when weathered, and clay-rich. The micrite is black on freshly broken surfaces and light-gray after weathering; characteristically petroliferous when freshly broken, thin- to medium-bedded, and grades from being almost absent in the lower portion to almost ubiquitous near the upper contact; Where locally fossiliferous, brachiopods are a primary constituent. Concretions are abundant locally including up to 4 inch (10 centimeter), bedded, light-orange siltstone concretions and cobble-sized septarian concretions. Conformable with the underlying Batesville Sandstone. 120 – 400 feet (37 – 122 meters) thick. Mbv Batesville Sandstone (Upper Mississippian, Chesterian) – Primarily sandstone units with lesser intervals of shale between them. Sandstone is tan to gray to dark-orange-gray on freshly broken surfaces and weathers buff to brown; typically either blocky and non-calcareous or rounded, calcareous and cross-bedded; bedding thickness is highly variable ranging from very thin to thick. The shale intervals are clay-rich, black on freshly broken surfaces, and tan to buff after weathering. Conformable with the Moorefield Formation. 40 – 120 feet (12 – 37 meters) thick. Mm Moorefield Formation (Upper Mississippian, Mermecian) – Consists primarily of shale, sandstone, and siltstone. The shale is the largest component and is usually dark-gray to black when freshly broken, buff after weathering, and clay-rich. The sandstone is typically silty, very fine grained and thick-bedded, but thin to medium beds are interspersed locally; dark-gray when freshly broken and brown to buff after weathering; Locally, it is very limey and fossiliferous with abundant, well-preserved brachiopods. The siltstone is usually similar in color and bedding to the sandstone. Near the unconformable contact with the Boone Formation, limey siltstone is common. Thickness ranges from 80 – 140 feet (24 - 43 meters). Topographic map of the Mountain View quadrangle showing location of data collection points. References Glick E. E., 1973, Preliminary Geologic map of the Mountain View quadrangle, Stone County, Arkansas: Arkansas Geological Commission, Geologic Worksheet, 1 sheet, 1:24,000. Ingram, R. L., 1954, Terminology for the Thickness of Stratification and Parting Units in Sedimentary Rocks: Geological Society of America Bulletin, v. 65, pp. 937 – 938. McFarland, J. D., 2004, Stratigraphic Summary of Arkansas: Arkansas Geological Commission, Information Circular 36, 38p. Rains, D. S., and Hutto R. S., 2012, Geologic Map of the Sylamore quadrangle, Izard and Stone Counties, Arkansas: Arkansas Geological Survey, Digital Geologic Map, DGM-AR-00844, 1 sheet, 1:24,000. Shepard, S. L., Dixon, J. C., and Davis, R. K., 2011, Are Ozark Streams Underfit? Using GIS to Re-Examine Dury’s Theory of Underfit Streams: Physical Geography, v. 32, no. 2, pp. 179 - 194. A North South A’ 5 Inclined bedding showing direction and magnitude of dip Symbols Contact Normal fault - bar and ball on downthrown side. Dotted where concealed Inactive gravel pit S45 Indicates orientation of fault plane A A’ Cross-section line Correlation of Map Units Osagean Meramecian Chesterian Holocene Pleistocene Morrowan Mbv Mm Mb Unconformity Unconformity Unconformity Mpi Mp Mf Ùhc Qls Of Su Unconformity Quaternary Pennsylvanian Mississippian Silurian Ordovician Unconformity Qat Introduction This map depicts the bedrock and surficial geology of the Mountain View 7.5-minute quadrangle. In this area approximately 1400 feet (427 meters) of Late Ordovician through Pennsylvanian (Morrowan) clastic and carbonate sedimentary rocks are near the surface. The bedrock is overlain by a veneer of Quaternary-age regolith. Regional geology of the area is controlled by an uplift centered in the St. Francois Mountains of southeast Missouri known as the Ozark Dome. Progressively younger rocks form a series of imbricate plateau surfaces from the core of the uplift southward into Arkansas. This map straddles the boundary between two of these surfaces: the Springfield Plateau in the northern part of the map, and the higher Boston Mountains Plateau to the south. The Springfield Plateau is capped by Mississippian-age rocks deposited in nearshore shallow marine and fluvial environments between 365 and 330 million years before present. The Boston Mountains Plateau surface is comprised primarily of Pennsylvanian-age rocks deposited in nearshore fluvial and deltaic environments between 330 and 290 million years before present. The recognized boundary between the plateaus, called the Boston Mountains Escarpment, forms a persistent and prominent cuesta with a steep north face that extends from just south of the town of Mountain View on the west side of the quadrangle, to Irons Mountain on the eastern margin. The geology of the Mountain View quadrangle was mapped in 1973 by E. E. Glick for the 1:500,000-scale Geologic Map of Arkansas. This map builds on the previous work but uses a more detailed stratigraphic section and depicts structures in greater detail. The contacts and structural features on the map are based primarily on field observations made from July 2012 - April 2013. Locations of data collection sites were recorded with a Garmin GPSmap 76 global positioning satellite receiver. Bedrock inclined at less than 2 o is shown as horizontal. Modified from Shepard et al., 2011 St. Francois Mountains Salem Plateau Springfield Plateau Boston Mountains Plateau Mountain View Quadrangle Boston Mountains Escarpment Ozark Dome MISSOURI ARKANSAS Ùhc Hale Formation (Pennsylvanian, Morrowan) – Consists of two members, the Prairie Grove and the Cane Hill. Only the Cane Hill Member is present on this quadrangle. Cane Hill Member consists of very thin to medium-bedded, and rarely thick-bedded, very fine grained, silty sandstone with shale interbeds. The sandstone is buff to brown on freshly broken and weathered surfaces, characteristically ripple- or flat-bedded, and typically weathers to flagstone; locally thick-bedded and cross bedded; Other rare features include liesegang boxwork, bioturbation, and plant fossils. The shale is typically not exposed but mostly clayey and black to dark-gray with rare liesegang boxwork. Unconformable with the underlying Imo interval. Up to 220 feet (67 meters) thick. Description of Map Units Qls Landslide deposits (Quaternary) - A mass of rock and debris that has moved downslope due to gravity. Only the largest landslide deposits are depicted. Alluvial terrace (Quaternary) - Unconsolidated clay, silt, sand and gravel on either the modern floodplain or the modern floodplain and one or more terrace levels. Qat N = 390 Joint Frequency Rose diagram of strike frequency of joints recorded within the Mountain View quadrangle 0 30 60 90 150 120 180 210 240 270 300 330 Interbedded siltstone and shale: Pitkin Limestone
Transcript of Mountain View Geologic Map - Arkansas View.pdfDatum is mean sea level ... time it was created. As...
Cane Hill
Imo interval
Mis
siss
ippi
an
0 ft
100
200
300
400
500
600
700
800
900
1000
1100
1200
0 m
100
200
300
1300 400
1400
1500
Pen
nsy
lvan
ian
Osa
gean
Ch
este
rian
Mer
amec
ian
Syste
m
Serie
s
Mor
row
an
Stratigraphic Column
Form
ation
Membe
r
Silu
rian
Ord
ovic
ian
Batesville Sandstone
Moorefield
Boone
Fayetteville Shale
Pitkin Limestone
Hale
Silurian Undifferentiated
Fernvale Limestone
limestone
sandstone shalelimestoneand chert
unconformable surface
shale withsiltstone
shale withsandstone
calcareousshale
ripple-beddedsandstone and shale
Arkansas Geological SurveyBekki White, State Geologist and Director Geologic Map of the Mountain View Quadrangle,
Stone County, ArkansasRichard S. Hutto and Daniel S. Rains
2013
Digital Geologic Quadrangle MapMountain View Quadrangle, Arkansas
DGM-AR-00604
0 46’
Approximate mean declination 2013
The topographic base is a Digital Raster Graphic (DRG). The DRG is a scanned image of a U.S. Geological Survey standard series topographic map published in 1969. Some of the colors of the original map have been modified and it is displayed at 40% transparency.
Polyconic projection. 1927 North American Datum.10,000-foot grid based on Arkansas coordinate system, north zone. (Lambert Conformal Conic).
100-meter Universal Transverse Mercator grid ticks, zone 15 shown in blue.
Light duty road
Unimproved road
Secondary highway
Road Classification
State Route
Geologic Cross Section A - A’Scale:
Horizontal: 1 inch = 2000 feetVertical: 1 inch = 500 feet (4X exaggeration)
Contour Interval 20 Feet
Datum is mean sea level
Map and cross-section digitized by Nathan Taylor.
Acknowledgments: This map was produced for The National Cooperative Geologic Mapping Program (STATEMAP), a matching-funds grant program administered by the U.S. Geological Survey, under Cooperative Agreement Award G12AC20224. Special thanks to the private landowners who graciously allowed access to their properties. Very special thanks to Angela Chandler for her tireless dedication to this mapping project.
Limitations: This map, like all geologic maps, is based on interpretations which were made from the data available at the time it was created. As work continues and new data is collected, the contacts and structures depicted on this map may be changed.
For the latest edition of this and other AGS maps and publications, please call Publication Sales at 501-296-1877, or visit the Vardelle Parham Geology Center, 3815 West Roosevelt Road, Little Rock, Arkansas 72204. This map is also available on our website in Portable Document Format at
http://www.geology.ar.gov/geologic_maps/dgm24k.htm
Suggested citation for this map:Hutto, Richard S., and Rains, Daniel S., 2013, Geologic map of the Mountain View quadrangle, Stone County, Arkansas: Arkansas Geological Survey, Digital Geologic Map, DGM-00604, 1 sheet 1:24,000.
Cane Hill
Imo shale
QUADRANGLE LOCATION
ARKANSAS
MbBoone Formation (Lower Mississippian, Osagean) - Typically consists of thick-bedded, finely granular to coarsely bioclastic limestone interbedded with chert nodules and anastomosing chert beds. The limestone is usually medium- to dark-gray on fresh surfaces and light-gray after weathering; common fossils include crinoids and brachiopods, though others have been noted (McFarland, 2004); pyrite crystals are rare. The chert is commonly white to gray on fresh and weathered surfaces, but weathers tan locally. Land surfaces developed in the Boone Formation are characterized by rolling hills with abundant sinkholes and springs, covered by unconsolidated regolith composed primarily of red clay and chert gravel. The St. Joe Member is poorly exposed or absent. Where present, it consists of approximately 3 feet (1 meter) of bioclastic, coarse-grained limestone. Its position near the base, and the absence of chert distinguish it from the upper Boone Formation. Locally there is a calcareous tannish-gray to gray, fine- to medium-grained sandstone that contains siltstone and quartz pebbles and is typically less than 1 foot (.5 meter) thick at the base of the St. Joe Member. Unconformable with the underlying Lafferty Limestone. The formation is 220 - 280 feet (67 - 85 meters) thick.
Fernvale Limestone (Upper Ordovician) – Coarsely bioclastic limestone. Pink to white to gray on freshly broken surfaces. Usually rounded, friable, moss-covered, and gray to white on weathered surfaces. Minor blueish-green shale sections and partings are rare. Locally contains 1 millimeter euhedral pyrite crystals. Up to 20 feet (9 meters) thick.
Of
SuSilurian rocks (undifferentiated) – Mostly very finely granular to micritic limestone of the Lafferty Limestone. Medium-gray with dark-red blebs on freshly broken surfaces and medium-gray on weathered surfaces. Thin- to medium-bedded and flat-bedded. Rare calcite veins. Some coarsely crystalline limestone and gray calcareous shale are present in one location which may represent Brassfield Limestone and or Ordovician Cason Shale. Unconformable with the underlying Fernvale Limestone. 25 - 30 feet (8 - 9 meters) thick.
Mpi
MpPitkin Limestone (Upper Mississippian, Chesterian) – Mostly thick-bedded, very finely to coarsely crystalline bioclastic limestone with lesser intervals of shale containing thin, slightly calcareous siltstone interbeds. The limestone is usually light- to medium-gray on freshly broken surfaces and gray after weathering; contains abundant fossil fragments including crinoid stems and Archimedes; locally oolitic and cross bedded. The shale and siltstone is black when freshly broken and buff on weathered surfaces. Well-developed nearly orthogonal joint-sets produce rectangular to rhombic siltstone float where the shale and siltstone intervals are weathering at the surface. Conformable with the underlying Fayetteville Shale. 140 – 400 feet (43 – 122 meters) thick.
Imo interval (Upper Mississippian, Chesterian) – Typically consists of thin- to thick-bedded sandstone intervals interbedded with shale. Sandstone is mostly very fine grained, buff to tan on fresh surfaces, and weathers to brown or grayish-brown; displays well-developed, abundant stylolitic surfaces, and well-preserved plant fossils including Calamites, Lepidodendron, and Stigmaria; contains coal traces; cross bedded sections are common throughout; honeycomb structure is a common development, and liesegang banding and soft-sediment deformation are preserved locally. The shale is mostly black on fresh surfaces, but locally gray; charcoal-gray to tan on weathered surfaces; contains poorly exposed fossiliferous zones with fragments of brachiopods, ammonoids, nautiloids, crinoids, gastropods, and rugosans. Locally there are flat gypsum laminae less than a quarter inch (6 millimeter) thick, limestone lenses typically no more than two feet (0.6 meter) thick, and fossiliferous conglomerate lenses up to three feet (1 meter) thick containing ferruginous pebble-size concretions. Conformable with the underlying Pitkin Limestone. 180 - 400 feet (55 - 122 meters) thick.
MfFayetteville Shale (Upper Mississippian, Chesterian) – Primarily composed of shale with interbedded micrite. The shale is black when freshly broken, dark-gray when weathered, and clay-rich. The micrite is black on freshly broken surfaces and light-gray after weathering; characteristically petroliferous when freshly broken, thin- to medium-bedded, and grades from being almost absent in the lower portion to almost ubiquitous near the upper contact; Where locally fossiliferous, brachiopods are a primary constituent. Concretions are abundant locally including up to 4 inch (10 centimeter), bedded, light-orange siltstone concretions and cobble-sized septarian concretions. Conformable with the underlying Batesville Sandstone. 120 – 400 feet (37 – 122 meters) thick.
MbvBatesville Sandstone (Upper Mississippian, Chesterian) – Primarily sandstone units with lesser intervals of shale between them. Sandstone is tan to gray to dark-orange-gray on freshly broken surfaces and weathers buff to brown; typically either blocky and non-calcareous or rounded, calcareous and cross-bedded; bedding thickness is highly variable ranging from very thin to thick. The shale intervals are clay-rich, black on freshly broken surfaces, and tan to buff after weathering. Conformable with the Moorefield Formation. 40 – 120 feet (12 – 37 meters) thick.
MmMoorefield Formation (Upper Mississippian, Mermecian) – Consists primarily of shale, sandstone, and siltstone. The shale is the largest component and is usually dark-gray to black when freshly broken, buff after weathering, and clay-rich. The sandstone is typically silty, very fine grained and thick-bedded, but thin to medium beds are interspersed locally; dark-gray when freshly broken and brown to buff after weathering; Locally, it is very limey and fossiliferous with abundant, well-preserved brachiopods. The siltstone is usually similar in color and bedding to the sandstone. Near the unconformable contact with the Boone Formation, limey siltstone is common. Thickness ranges from 80 – 140 feet (24 - 43 meters).
Topographic map of the Mountain View quadrangle showing location of data collection points.
References
Glick E. E., 1973, Preliminary Geologic map of the Mountain View quadrangle, Stone County, Arkansas: Arkansas Geological Commission, Geologic Worksheet, 1 sheet, 1:24,000.
Ingram, R. L., 1954, Terminology for the Thickness of Stratification and Parting Units in Sedimentary Rocks: Geological Society of America Bulletin, v. 65, pp. 937 – 938.
McFarland, J. D., 2004, Stratigraphic Summary of Arkansas: Arkansas Geological Commission, Information Circular 36, 38p.
Rains, D. S., and Hutto R. S., 2012, Geologic Map of the Sylamore quadrangle, Izard and Stone Counties, Arkansas: Arkansas Geological Survey, Digital Geologic Map, DGM-AR-00844, 1 sheet, 1:24,000.
Shepard, S. L., Dixon, J. C., and Davis, R. K., 2011, Are Ozark Streams Underfit? Using GIS to Re-Examine Dury’s Theory of Underfit Streams: Physical Geography, v. 32, no. 2, pp. 179 - 194.
ANorth South
A’
5 Inclined bedding showing directionand magnitude of dip
Symbols
Contact
Normal fault - bar and ball ondownthrown side. Dotted whereconcealed
Inactive gravel pit
S45 Indicates orientation of fault plane
A A’ Cross-section line
Correlation of Map Units
Osagean
Meramecian
Chesterian
HolocenePleistocene
Morrowan
Mbv
Mm
Mb
Unconformity
Unconformity
Unconformity
Mpi
Mp
Mf
Ùhc
Qls
Of
Su
Unconformity
Quaternary
Pennsylvanian
Mississippian
Silurian
Ordovician
Unconformity
Qat
Introduction
This map depicts the bedrock and surficial geology of the Mountain View 7.5-minute quadrangle. In this area approximately 1400 feet (427 meters) of Late Ordovician through Pennsylvanian (Morrowan) clastic and carbonate sedimentary rocks are near the surface. The bedrock is overlain by a veneer of Quaternary-age regolith. Regional geology of the area is controlled by an uplift centered in the St. Francois Mountains of southeast Missouri known as the Ozark Dome. Progressively younger rocks form a series of imbricate plateau surfaces from the core of the uplift southward into Arkansas. This map straddles the boundary between two of these surfaces: the Springfield Plateau in the northern part of the map, and the higher Boston Mountains Plateau to the south. The Springfield Plateau is capped by Mississippian-age rocks deposited in nearshore shallow marine and fluvial environments between 365 and 330 million years before present. The Boston Mountains Plateau surface is comprised primarily of Pennsylvanian-age rocks deposited in nearshore fluvial and deltaic environments between 330 and 290 million years before present. The recognized boundary between the plateaus, called the Boston Mountains Escarpment, forms a persistent and prominent cuesta with a steep north face that extends from just south of the town of Mountain View on the west side of the quadrangle, to Irons Mountain on the eastern margin.
The geology of the Mountain View quadrangle was mapped in 1973 by E. E. Glick for the 1:500,000-scale Geologic Map of Arkansas. This map builds on the previous work but uses a more detailed stratigraphic section and depicts structures in greater detail. The contacts and structural features on the map are based primarily on field observations made from July 2012 - April 2013. Locations of data collection sites were recorded with a Garmin GPSmap 76 global positioning satellite receiver. Bedrock inclined at less than 2o is shown as horizontal.
Modified from Shepard et al., 2011
St. FrancoisMountains
Salem Plateau
SpringfieldPlateau
Boston Mountains Plateau
Mountain ViewQuadrangleBoston Mountains
Escarpment
Ozark DomeMISSOURIARKANSAS
Ùhc
Hale Formation (Pennsylvanian, Morrowan) – Consists of two members, the Prairie Grove and the Cane Hill. Only the Cane Hill Member is present on this quadrangle. Cane Hill Member consists of very thin to medium-bedded, and rarely thick-bedded, very fine grained, silty sandstone with shale interbeds. The sandstone is buff to brown on freshly broken and weathered surfaces, characteristically ripple- or flat-bedded, and typically weathers to flagstone; locally thick-bedded and cross bedded; Other rare features include liesegang boxwork, bioturbation, and plant fossils. The shale is typically not exposed but mostly clayey and black to dark-gray with rare liesegang boxwork. Unconformable with the underlying Imo interval. Up to 220 feet (67 meters) thick.
Description of Map Units
QlsLandslide deposits (Quaternary) - A mass of rock and debris that has moved downslope due to gravity. Only the largest landslide deposits are depicted.
Alluvial terrace (Quaternary) - Unconsolidated clay, silt, sand and gravel on either the modern floodplain or the modern floodplain and one or more terrace levels.
Qat
N = 390
Joint Frequency
Rose diagram of strike frequency of jointsrecorded within the Mountain View quadrangle
030
60
90
150
120
180210
240
270
300
330
Interbedded siltstone and shale: Pitkin Limestone
