Vertical arrangement in layers of rock units whose sequence is used to study the geological history of the strata.
Bedrock geologic map of Vermont [ More info] At a scale of 1:100,000, this map shows an uncommon level of detail for State geologic maps. Mapped rock units are primarily based on lithology, or rock type, to facilitate derivative studies in multiple disciplines.
Generalized geologic map of the Yosemite National Park area [ More info] Surficial geologic map of the Yosemite National Park area with links to the legend and text.
Generalized surficial geologic map of the Pueblo 1 degree x 2 degree quadrangle, Colorado. [ More info] Surficial geologic map of the Pueblo quadrangle in Colorado with text and references in PDF format, metadata, and GIS files to download.
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.
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.
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.
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)
Southern California Areal Mapping Project (SCAMP): find geologic maps [ More info] Download digital geologic databases produced by the Southern California Areal Mapping Project (SCAMP) or view SCAMP work in progress by clicking on 1:100,000-scale, 30x60 minute quadrangles.
Alphabetical Index of Topics
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