This data set contains boundaries and tags for major geologic units in the
conterminous United States. In addition to the polygons representing the areal
extent of geologic units, it identifies boundaries ...
These data are intended for science researchers, students, policy makers, and
the general public. The data can be used with geographic information systems
(GIS) or other software to display bathymetry ...
[from USGS Open-File Report 03-6 homepage,
In June, 2002, the U.S. Geological Survey (USGS) established 143 new gravity
stations and 12 new rock samples ...