Title:
USGS Geologic Map Database of the Conterminous United States
Originator:
US Geological Survey, Mineral Resources Program
Abstract:
This vector layer presents the
results of the USGS Mineral Resources Program activity to compile a
national-scale geologic map database to support national and regional level
projects, including mineral resource and geo-environmental assessments. Previously,
the only comprehensive sources of regional- and national-scale geologic maps were
state geologic maps with scales ranging from1:100,000 to 1:1,000,000. Digital
versions of these state maps form the core of what is presented here. These
maps and databases were released in blocks of states. The digital zipped file geodatabase for
the conterminous US was downloaded from https://mrdata.usgs.gov/geology/state/
.
Purpose:
A primary goal of this work is to
develop geologic map datasets with standardized structure and attribution. The
database design and standards are documented at https://mrdata.usgs.gov/geology/state/.
The intent is that contiguous databases can be merged seamlessly and without
any additional effort.
In addition to a common
database structure, the conterminous U.S. state databases (the contiguous 48
states) have been fitted to a set of standard state boundaries so that, when
states are merged, they match without slivers or overlap.
No attempt has been made to reconcile
differences in mapping across state boundaries.
These data are prepared for use by the Natural Resources
Conservation Service for USDA Service Center personnel to administer agency
programs.
Format: Vector - polygons.
Spatial
Reference Information:
GCS_North_American_1983
