USGS Geoscience Data Catalog
Additional USGS Geoscience data can be found by geographic location or by publication series.
Kellogg, Karl S., Bartos, Paul, J., and Williams, Cindy L., 2002, Geologic map of the Frisco quadrangle, Summit County, Colorado: U.S. Geological Survey Miscellaneous Field Studies Map MF-2340, U.S. Geological Survey, Denver, Colorado.Online Links:
This is a Vector data set.
The map projection used is Polyconic.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 20
Ordinates (y-coordinates) are specified to the nearest 20
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 205 | af 207 | dt 148 | Qal 165 | Qs 164 | Qav 163 | Qry 161 | Qr 176 | Qtr 147 | Qf 162 | Qt 101 | Qc 100 | Qac 155 | Qls 152 | Qg 206 | Qop 200 | Qtp 201 | Qtb 204 | Qgo 210 | Qgm 202 | Qgg 175 | Qd 153 | QTls 220 | Tqp 233 | Kpm 232 | Kps 231 | Kpl 240 | Kn 242 | Kb 106 | Kd 104 | Jm 105 | Je 107 | TrPcm 162 | Xu 266 | Xgg 264 | Xgd 259 | Xmg 263 | Xhpg 250 | Xbg 255 | YXp 257 | Yxdi 262 | YXu 265 | XumDEFINITION OF CODES IN THE DATABASE COVERAGES (CODES AND TEXT LISTED IN THE .AAT AND .PAT FILES)
CODE | TEXT (DEFINITION) 1 | contact; certain 2 | contact; approximately located 3 | contact; concealed 11 | fault; certain 12 | fault; approximately located 13 | fault; concealed 21 | normal fault; certain 22 | normal fault; approximately located 23 | normal fault; concealed 31 | thrust fault; certain; upthrown on right side 32 | thrust fault; approximate location; upthrown on right side 33 | thrust fault; concealed; upthrown on right side 41 | reverse fault; certain 42 | reverse fault; approximately located 43 | reverse fault; concealed 51 | syncline axis; certain 52 | syncline axis; concealed 61 | anticline axis; certain 62 | anticline axis; concealed 65 | strike-slip arrows 71 | dike or sill 72 | quartz vein 93 | water boundary 94 | scratch contact 95 | cross-section line 99 | map boundary 200 | plunge arrow 201 | bedding attitude (P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle) 202 | strike and dip foliation symbol 203 | plunge and bearing (lineation)symbol 204 | anticline arrows(P1=orientation azimuth) 205 | syncline arrows(P1=orientation azimuth) 207 | bar and ball symbol(P1=orientation azimuth) 208 | dip symbol on contact or fault (P1=strike azimuth, P2=dip angle) 209 | left-lateral arrows (P1=orientation azimuth) 210 | right-lateral arrows(P1=orientation azimuth) 213 | strike and dip of joints symbol (P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle) 217 | fold plunge arrow symbol(P1=orientation azimuth) 219 | strike and dip of overturned beds symbol(P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle) 220 | strike and dip, approximate (P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle) 221 | vertical bed symbol(P1=orientation azimuth) 222 | vertical foliation symbol(P1=orientation azimuth) 230 | vertical joint symbol(P1=orientation azimuth) 246 | strike with undetermined dip symbol(P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle) 251 | strike and dip of foliation symbol(P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle) 500 | Unit labels text & tag 501 | Hidden unit tags 502 | rock text 510 | ordinary text 701 | Splined text
A.M. Licamelli, R.G. Kuehn, K.S. Morgan
303-236-1305 (voice)
303-236-0214 (FAX)
kkellogg@usgs.gov
To update and reinterpret earlier geologic mapping, and to achieve a uniform regional geologic database.
Kellogg, Karl, Bartos, Paul, and Williams, Cindy, (unpublished), unpublished mapping done in 1997 and 1998.
Data was entered and checked by the geologist who made the 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 mapped by ground investigation and photo-interpretation of 1:24,000-scale color aerial photographs. These lines were digitized from the topographic field sheets and from annotated aerial photographs. Most digitized positions on the map are estimated to have about 20 m horizontal accuracy. Additional point observations were added using positions determined by a Rockwell PLGR-96 GPS unit with horizontal accuracy of about 10 m. There is no elevation data in the database.
Data is complete: no features were eliminated or generalized. Unit properties are described in the text explanation. A digital base map coverage is not included but is available separately.
Map elements were visually checked by the author for overshoots, undershoots, duplicate features, polygon attributes, and other errors. Automated (ARC/INFO) 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. The map was reviewed by 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.
303-236-7431 (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://pubs.usgs.gov/mf/2002/mf-2340/mf-2340.tar.gz> <http://pubs.usgs.gov/mf/2002/mf-2340/mf-2340.zip> |
Data format: | Geologic units and structural features in format Shapefile (version 1.0) |
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Network links: |
<http://pubs.usgs.gov/mf/2002/mf-2340/mf-2340.tar.gz> <http://pubs.usgs.gov/mf/2002/mf-2340/mf-2340.zip> |
1-888-ASK-USGS (voice)
MF-2340 (Map-on-Demand)
None
Available as one printed map 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.
303-236-1305 (voice)