geologic map of the silt quadrangle, garfield county, … · 2001. 3. 23. · twav twm qls kwfl...
TRANSCRIPT
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Alluvial DepositsAlluvial and
Colluvial Deposits Colluvial Deposits Eolian DepositsArtificial
Fill Deposits
CORRELATION OF MAP UNITS
QloQto
Holocene
Pleistocene
UpperCretaceous
Paleocene
Eocene
QUATERNARY
TERTIARY
CRETACEOUS
MISCELLANEOUS FIELD STUDIES MAP MF - 2331Version 1.0
Pamphlet accompanies map
U.S DEPARTMENT OF THE INTERIORU.S. GEOLOGICAL SURVEY
Surficial geology was mapped by Ralph Shroba in 1992-1994 and byRobert Scott in 1996. Anne Egger provided field assistance in 1996.Digital compilation was begun by Heidi Torrelday in 1996, continuedby Robert Scott, Michael Helbraun, and Elijah Kempton in 1999. Digital Cartography by Theodore Brandt was completed in 2000.
Artificial fill (latest Holocene)
Flood-plain and stream-channel deposits (Holocene and late Pleistocene)
Younger terrace alluvium (late Pleistocene)
Intermediate terrace alluvium (late Pleistocene)
Older terrace alluvium (late middle Pleistocene)
Basaltic alluvium (late middle Pleistocene)
Oldest terrace alluvium (middle Pleistocene)
Younger fan-alluvium and debris-flow deposits (Holocene and latest Pleistocene)
Alluvium and colluvium, undivided (Holocene and late Pleistocene)
Pediment deposits (middle Pleistocene)
Colluvium, undivided (Holocene to middle? Pleistocene)
Sheetwash deposits (Holocene and late Pleistocene)
Sheetwash deposits over loess
Landslide deposits (Holocene to middle? Pleistocene)
Debris-flow deposits (Holocene? to middle? Pleistocene)
Older debris-flow deposits (early? Pleistocene)
Loess (late and middle? Pleistocene)
Loess over younger terrace alluvium
Loess over older terrace alluvium
Loess over oldest terrace alluvium
Loess over debris-flow deposits
Loess over pediment deposits
Loess over oldest terrace alluvium over pediment deposits
Wasatch Formation (in cross section only) (Eocene to Paleocene)
Shire Member (Eocene)
Sandstone unit
Molina Member (Eocene)
Atwell Gulch Member (in cross section only) (Paleocene)
Volcaniclastic-rich unit
Lower unit
Mesaverde Group (in cross section only) (Upper Cretaceous)
Williams Fork Formation
Upper unnamed sandstone unit
Lower unnamed sandstone unit
Iles Formation
Rollins Sandstone Member
Cozzette Sandstone and Corcoran Sandstone Members, undivided
Baked zone in the Mesaverde Group
Mancos Shale, Upper member (Upper Cretaceous)
Gravelly alluvium (late and middle Pleistocene)
LIST OF MAP UNITS
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Loess over intermediate terrace alluviumQtmQlo
ARTIFICIAL-FILL DEPOSITS
ALLUVIAL DEPOSITS
ALLUVIAL AND COLLUVIAL DEPOSITS
COLLUVIAL DEPOSITS
EOLIAN DEPOSITS
BEDROCK UNITS
SCALE 1: 24 000
CONTOUR INTERVAL 40 FEETDOTTED LINES REPRESENT 20-FOOT CONTOURS
NATIONAL GEODETIC VERTICAL DATUM OF 1929
COLORADO
QUADRANGLE LOCATION
1987 MAGNETIC DECLINATIONAT CENTER OF SHEET
TRU
E N
OR
TH
MA
GN
ETIC
NO
RTH
12 ˚
1 MILE1 1/ 2 0
7000 FEET0 2000 3000 4000 5000 6000
.5 1 KILOMETER1 0
1/2
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Qsw Qsw QswQc QswQlo/Qto
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Top of Rollins Sandstone Member, Iles Formation
Top of Cozzette Sandstone Member, Iles Formation
Top of Corcoran Sandstone Member, Iles Formation
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8230 TD
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Grand Hogback
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2
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2
KILOMETERS KILOMETERS
KILOMETERSKILOMETERS
GEOLOGIC MAP OF THE SILT QUADRANGLE, GARFIELD COUNTY, COLORADOBy
Ralph R. Shroba and Robert B. Scott
2001
Contact--Solid where definite, dashed on map where
Limit of overturned strata
Syncline axial trace--Solid arrow shows direction of plunge
Strike and dip of bed
Horizontal
Overturned
Inclined
and total depth (TD) in feet
Dry hole--Showing name of drilling company
Gas well--Showing name of drilling company
and total depth (TD) in feet
Adit
Koch Explor8230 TD
Carter andCarter6147 TD
74
65
approximately located, dashed in cross section toshow stratal attitudes at depth
Any use of trade names in this publication is fordescriptive purposes only and does not implyendorsement by the U.S. Government.
For sale by U.S. Geological Survey Information ServicesBox 25286, Federal Center, Denver, CO 80225
This map was produced on request, directly fromdigital files, on an electronic plotter. It is also availableas a PDF file at http://greenwood.cr.usgs.gov
Base from U.S. Geological Survey, 1987
Polyconic projection, 1927 North American Datum
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CarterandCarter6147 TD
San Comp91 TD
Koch Explor8230 TD
A'
A
B'
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RIFLE SYNCLINE
G R A N D
H O G B A C K
8
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