Conversion of the geologic map of the U.S. to a digital format was undertaken to facilitate the presentation and analysis of earth-science data. Digital maps can be displayed at any scale or projection, whereas a paper map has a fixed scale and projection. However, the geology on this disc is not intended to be used at any scale finer than 1:2,500,000.
TMC Tmc TMOE Tmoe UTA uTaThe uppercase names are used in the coverage because an INFO sort in ARC/INFO is case sensitive. The lookup tables must be sorted to work correctly. The mixed-case rock-unit names are in the kbcolor.lut lookup table. Longer rock-unit descriptions such as:
Cretaceous granitic rocks Washita Groupare in the ROCKDESC column of the .pat file of the KBLEG coverage. Some of the unit names have been modified to avoid ambiguity. The Pennsylvanian symbol is stored as PP in:
PP PP1 PP1a PP2 PP3 PP4The Triassic symbol is stored as Tr in:
JTr Tr TrPe Trv Tri TrgThe Cambrian symbol is stored as C in:
C Cq OC Ce Cv Cg m1 is replaced with mm1 to avoid confusion with M1 m2 is replaced with mm2 to avoid confusion with M2 m3 is replaced with mm3 to avoid confusion with M3 m4 is replaced with mm4 for consistencyThe extent of glaciation appears in the legend but is not present in the coverage.
Are there legal restrictions on access or use of the data?
This Compact Disc-Read Only Memory (CD-ROM) publication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data and software published on this CD-ROM have been used by the USGS, no warranty, expressed or implied, is made by the U.S. Geological Survey as to the accuracy of the data and related materials and/or the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data, software, or related materials. Graphical map depictions on this disc are intended to be used within the map scale limits applicable to the source data. Although software enables the user to show images on the disc at various scales, the user is cautioned to refer to the source documentation for the appropriate map scale limitations.
|Data format:||Geology and fault coverages in format ArcInfo export (version 7.1.1) Size: 22|
|Data format:||Geologic units and faults, geographic, NAD83 in format Shapefile (version 1.0) Size: 22|
|Data format:||Bedrock map unit and fault coverages in format ARC/INFO coverage (version 7.1.1) Size: 16|
|Data format:||Geologic map units and brief descriptions in format OGC WMS (version 1.3.0)|
|Data format:||Geologic map units and brief descriptions in format OGC WFS (version 1.1.0)|