Vertical arrangement in layers of rock units whose sequence is used to study the geological history of the strata.
Geologic glossary for National Parks [ More info] Geologic glossary containing simplified definitions for technical terms used within the USGS/National Park Service website on national parks.
Geology of the Chesapeake and Ohio Canal National Historical Park and Potomac River Corridor, District of Columbia, Maryland, West Virginia, and Virginia [ More info] Rocks representing a variety of tectonic and depositional environments outcrop along the canal and towpath and reveal the geologic history of the central Appalachian region from the Mesoproterozoic to Jurassic Period.
Geology of the onshore part of San Mateo County, California: a digital database [ More info] This digital map database represents the general distribution of the geology (bedrock and surficial deposits) in San Mateo County. Accompanying text file (*.txt or *.ps) provides current information on the geologic structure and stratigraphy.
Integrated geologic, geochemical, and geophysical studies of Big Bend National Park, Texas [ More info] Coordinated studies of the effect of historical mining for mercury, origin and composition of metals in groundwaters and surface waters, history of volcanic and intrusive activity, and the complex geological history of this area.
Long Island Sound sidescan sonar mosaics [ More info] Sidescan sonar image, surficial geologic interpretation, and bathymetry of the Long Island Sound sea floor.
National Cooperative Geologic Mapping Program [ More info] Geological mapping carried out by USGS in close cooperation with state, university, and federal partners. Includes general information about geological maps and mapping standards.
National Geologic Map Database Catalog [ More info] Search tool for locating print and online U.S. geologic maps by area, title, author, etc.
Pacific Northwest geologic mapping and urban hazards [ More info] Overview of the Pacific Northwest Urban Corridor Geologic Mapping Program concerned with geology and urban hazards with links to online geologic maps, current research, publications, and contacts.
Pennsylvania downloadable spatial data (GIS data files) [ More info] Pennsylvania digital data for watershed boundaries, county geology, and flood mapping in Arc/Info format compressed with gzip utility for downloading plus links to other sources of data.
Preliminary geologic map of the Santa Barbara coastal plain area, Santa Barbara County, California [ More info] A geologic map of the Santa Barbara coastal plain region in PDF format with data in GIS format (ArcInfo export, shapefile, and TIFF)
Alphabetical Index of Topics
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