Geology of the Conterminous U.S. at 1:2,500,000 Scale
Contents: Overview | ArcView Project | Data Layers | Data Access | Documentation and Links
Overview
From USGS--"The U.S. Geological Survey has published a new Geologic Map of the United States (exclusive of Alaska and Hawaii) on a scale of 1:2,500,000, which was compiled between 1967 and 1971 by Philip B. King and Helen M. Beikman, with geologic cartography by Gertrude J. Edmonston. The map replaces the now outdated Geologic Map of the United States on the same scale, which was compiled by George W. Stose and Olof A. Ljungstedt and was issued by the U.S. Geological Survey in l932." The linework was captured by hand-digitizing as well as scanning and autovectorizing from the paper map and negatives.
Data are available in ArcInfo export file (.e00) and DLG formats. An ArcView project for enhanced viewing of the data is provided. Also included are ARCPLOT and ArcView files in .gra, .eps, .ai6, and .pdf formats.
ArcView Project
The ArcView project kb.apr is available on the CD-ROM in the /ArcView directory or is downloadable from the Geology of the Conterminous United States site at: http://pubs.usgs.gov/dds/dds11/
Data Layers
Data are in geographic coordinates. The accompanying ArcView project represents the data in Albers Equal Area projection. Layers included:
- Geology [file: kbge] (26.9 mb)
- Faults [file: kbf] (5.2 mb)
- Legend [file: kbleg] (0.5 mb)
- Glacial [file: kbgl] (0.15 mb)
Documentation: Data documentation is available in PDF format on the CD-ROM and is downloadable from http://pubs.usgs.gov/dds/dds11/kb.html.
Data Access
CD-ROM: The geology map data is available on CD-ROM in the DH Hill Library Reference Area, Location: I 19.121:11 1998 (Govt. CD-ROM Cabinet). An earlier version (1994) of this data is available under call number: I 19.121:11.
Download : The geology map data is downloadable from http://minerals.usgs.gov/kb/
Interactive Mapping
The geology and faults data may be viewed interactively, online via the Mineral Resources Online Spatial Data server at: http://mrdata.usgs.gov/.
Documentation and Links
Geology of the Conterminous United States Web Page
Mineral Resources Online Spatial Data
Go to the GIS Data List Page
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