USGS Geoscience Data Catalog
Additional USGS Geoscience data can be found by geographic location or by publication series.
Scott, Robert B. , Shroba, Ralph R. , and Egger, Anne E. , 2001, Geologic map of the Rifle Falls quadrangle, Garfield County, Colorado: U.S. Geological Survey Miscellaneous Field Studies Map MF-2341, U.S. Geological Survey, Denver, Colorado.Online Links:
This is a Vector data set.
The map projection used is LAMBERT CONFORMAL CONIC.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 10
Ordinates (y-coordinates) are specified to the nearest 10
Planar coordinates are specified in METERS
The horizontal datum used is North American Datum of 1927.
The ellipsoid used is Clarke 1866.
The semi-major axis of the ellipsoid used is 6378206.4.
The flattening of the ellipsoid used is 1/294.98.
P1 | GEOLOGIC MAP UNIT LABELS 100 | af 124 | Qac 126 | Qfy 127 | Qlo/Qfo 131 | Qlo/Qp 134 | QTg 136 | Qc 138 | Qsw 141 | Qfp 142 | Qls 154 | Qd 155 | Qg 167 | Qlo/Qg 169 | Qcm 171 | shear zone 180 | Qlo 184 | Qtu 413 | Kicc 432 | Kmu 437 | Kmn 444 | Kml 458 | Kd 466 | Jm 469 | Jeg 472 | Je 486 | @c 498 | @Ps 550 | &ee 564 | Ml 566 | Dc 567 | Ddc 569 | Ddb 582 | P&ml 584 | Pms 612 | &b 684 | Water 685 | O\u 686 | &ev 687 | &evl 689 | Dp Note: @ = Triassic; & = Pennsylvanian; \ = CambrianDEFINITION OF CODES IN THE DATABASE COVERAGES (CODES AND TEXT LISTED IN THE .AAT AND .PAT FILES)
CODE | FEATURE 001 | contact; certain 003 | contact; inferred 008 | landslide; scarp; contact 009 | landslide on fault; contact certain 010 | fault; contact; certain 011 | fault; contact; concealed 014 | fault; contact; inferred 032 | fault; strike slip; concealed 034 | fault contact; strike slip; inferred 040 | thrust fault contact; certain 041 | thrust fault; concealed 044 | thrust fault contact; approximate location 070 | fold axis; anticline; certain 071 | fold axis; anticline; concealed 074 | fold axis; syncline; certain 075 | fold axis; syncline; concealed 078 | line of section 088 | intrusive dike; contact; certain 089 | 'intrusive dike; contact; concealed 093 | water boundary, certain 097 | scratch boundary 099 | map boundary 201 | bedding attitude symbol 203 | fault dip symbol 204 | anticline symbol 205 | syncline symbol 206 | adit symbol 207 | ball & bar symbol 209 | left lateral symbol 219 | over turned bed symbol 242 | Question mark symbol to indicate uncertainty in a reach of a linear feature 268 | diamond arrow symbol 300 | Plots the symbol number read from P2 362 | Flat bedding symbol 500 | Unit labels text & tag 501 | Hidden unit tags 502 | Ordinary text 503 | Ordinary text 700 | Splined text
Cooperating agencies: Garfield County, U.S. Bureau of Land Management, U.S. Forest Service, Colorado Geological Survey
303-236-1230 (voice)
rbscott@usgs.gov
This map was funded by the National Cooperative Geologic Mapping Program. The map is a product of the I-70 Urban Corridor Project. This corridor is experiencing rapid urban growth and geologic mapping is needed to aid in land development planning in order to address, avoid, or mitigate known and potential geologic hazards.
Data were entered and checked by the geologist that made the field observations. The attributes of this geospatial data set consist of text identifiers and numeric codes that indicate the identity of the geologic unit or type of geologic feature, and determine how each feature is colored or symbolized. To check attribute accuracy, a color check plot was visually compared to the geologist's original compilation. Discrepancies between the digital geospatial dataset and the original analog compilation were corrected as needed. Machine-created listings of unique attribute values were used to identify spelling errors or other inconsistencies, and corrections were made as needed. This map has been thoroughly reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature.
Lines were primarily positioned by photointerpretation of 1:24,000-scale color aerial photographs using a PG-2 photogrammetric plotter that rectified the position and transferred it to a basemap. Lines were digitized from the basemap using a digitizer tablet with resolution of 0.001 inch and most digitized positions on the map are estimated to have about 20 m horizontal accuracy.
Data are complete: no features that could be accurately represented at the compilation scale of 1:24,000 were eliminated or generalized. The smallest area represented is approximately 400 square meters. All geospatial database elements are attributed.
Map elements were visually checked for overshoots, undershoots, duplicate features, polygon closure, and other errors by the author and by the GIS technician(s) that created the digital database. Automated (ArcInfo) routines were also used to check the databases for polygon label errors, line or point attribution errors, sliver polygons, dangling arcs, intersection errors, and projection information. Check plots of the map were reviewed by at least two other geologists for consistency with basic geologic principles and general conformity to USGS mapping standards.
Are there legal restrictions on access or use of the data?
- Access_Constraints: none
- Use_Constraints:
- none. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data.
303-236-5486 (voice)
Although this digital spatial data has been subjected to rigorous review and is substantially complete, it is released on the condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
Data format: | Geologic units and structural features in format ArcInfo export (version 7.1.2) |
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Network links: |
<http://greenwood.cr.usgs.gov/pub/mf-maps/mf-2341/mf-2341.tar.gz> <http://greenwood.cr.usgs.gov/pub/mf-maps/mf-2341/mf-2341.zip> |
Data format: | Geologic units and structural features in format Shapefile (version 1.0) |
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Network links: |
<http://greenwood.cr.usgs.gov/pub/mf-maps/mf-2341/mf-2341.tar.gz> <http://greenwood.cr.usgs.gov/pub/mf-maps/mf-2341/mf-2341.zip> |
1-888-ASK-USGS (voice)
MF-2341 (Map-on-Demand)
none
Available as one printed sheet plus one pamphlet. Order from USGS at the address listed above or see <http://rockyweb.cr.usgs.gov/mod/index.html> for more ordering information.
for current prices please see <http://rockyweb.cr.usgs.gov/mod/order.html>
303-236-1230 (voice)