The U.S. Geological Survey hosts the National Geologic Map Database (NGMDB). This interactive tool serves as a national archive for high-quality, standardized geologic maps created by the U.S. Geological Survey and state geological surveys.
The MapView section of the NGMDB displays geologic maps from across the country dating back to 1879. The database is searchable by address, and results can be narrowed further using scale and date filters.
The American Geosciences Institute (AGI) has launched a new online resource, the Geological Surveys Database, to support the public discovery of a critical source of reliable geoscience information. This new database provides a state-of-the-art portal for decision makers and others to search and discover state geological survey publications and U.S. Geological Survey factsheets.
To activate your GeoRef Specialty Database Day Pass, please enter your day-pass code, email address, a password, and your country of residence. Once you activate your day pass, you will be directed to login to the system using the email address and password you provided. The Day Pass will allow you full access to the system for 24 hours.
If you have previously used a day pass, please complete this form - it will reuse your account and update your password.
Geologic guidebooks tell stories about the history of our continent's beautiful natural landscapes, but to date they have not been easily obtained by today's researchers. To facilitate greater access to these guidebooks, the American Geosciences Institute (AGI) and the Geoscience Information Society (GSIS) have jointly launched a free database, which catalogs decades of these guidebooks from across the United States, Canada, and Mexico.