Geologic Map Quadrangles
USGS 1:24,000 scale topographic maps are an excellent base for creating geologic maps. They are a convenient size and allow detailed portrayal of complex geology and have long been the standard base for detailed maps. Geologic maps of larger areas, like our state geologic map, are often derived from these more-detailed products.
We have several series of geologic map products at this scale, from both the bureau and from the USGS. Many of these maps are available both as printed maps and as free PDF files. Digital map files (GIS products) are available for some maps.
See: 'What is a geologic map and what are they used for?' for a discussion of geologic maps.
Types of Geologic Maps of 7.5-minute Quadrangles Available
- Open File Geologic Maps (OFGM-series) are products from our STATEMAP Program. The geologic field work and basic research are a primary source of geoscience information for our staff and other geoscientists throughout the region (see our index of STATEMAP open-filed geologic maps).
- GM-series geologic maps from the NMBGMR are high-quality offset-printed paper maps. Our open-filed products will migrate to this series following rigorous review and cartographic production.
- We carry most geologic maps of New Mexico published by the USGS. Please visit or call us to see if the map you're interested in is in stock.
Searching for geologic maps that cover a given area can be complicated because maps may cover unpredicable areas (e.g. quadrangles, counties, study areas, etc.) and be at various scales. Aside from our statewide maps, most of our maps are of 7.5 minute quadrangles (search by name). Another way to locate maps is to use the USGS National Geologic Map Database which catalogs maps in various searchable ways. You can also download an index map showing available geologic maps of 7.5 minute quadrangles in PDF format (10 MB; see image above) and then use the 'Find' function to search for quadrangle names.