Characteristics of bedrock and surficial geologic terranes and structural features at various levels of detail. The information provided here are intended for use in the synoptic study of large areas, and are likely not suitable for detailed study of geographically specific localities.
Digital geologic maps of the US states with consistent lithology, age, GIS database structure, and format. Scale typically 1:500,000.
Digital compilation and reinterpretation of published and unpublished geologic mapping of Alaska.
This detailed geologic map database has not yet been arranged to match the structure of the state geologic map compilation.
Geologic units and faults from USGS Open File Report 98-38, concerning assessment of the mineral resources of Puerto Rico.
A digital version of the King and Beikman (1974) Geologic Map of the United States, originally published at a scale of 1:2,500,000. It excludes Alaska and Hawaii.
World geology compiled by the Geological Survey of Canada at approximately 1:35,000,000 scale, specifying age (to era) and general lithology of major geologic units, with sources.
A national catalog of geologic maps produced by US Federal agencies, state agencies, and academic organizations. Includes information at many different scales, with links to maps available in digital form as well as to maps that are available in paper form.
Includes geologic units and structural features at a broad scale for continents outside North America.