Maps Produced By The U.S. Government

A collaborative effort between the USGS and the Association of American State Geologists (AASG), the NGMDB is an online catalog of over 95,000 geoscience maps and reports from over 630 publishers. Items date back to the 1800s. Formats available include PDF, GeoTiff, Google Earth KMZ, and GIS vector.

Various search functions allow users to search by keywords, themes, location, scale, date, format, and publisher. Search can be limited to items available online or specific digital formats, such as GeoTiff, Google Earth KMZ, GIS vector data.

Map viewer of the NGMDB.
By default, the most recent geologic maps available are overlaid on a base map. Use the tools on the right to filter by scale, adjust the opacity, or go to a specific location. Zoom and pan to the location of interest, then click the map to identify the area. From the pop-up, opt to select publications in the selected location, publications on-screen, or browse and download the map currently being viewed. Clicking the buttons brings the user to the NGMDB catalog. Maps are still being added to mapView state by state. Click the “Catalog” button to search the entire NGMDB catalog.

Click the map to go to individual state geological survey websites. The information provided by state survey sites differs from state to state. The first state geological survey was established in 1823 in North Carolina.