Intended to give a quick browse and query of our Nation's geologic maps, in a standardized format, and link you to the source of the information found via the NGMDB Map Catalog and Geologic Names Lexicon. More then 80,000 maps and reports, by 370 publishers, are accessible. Maps and related data are available for: geology, hazards, earth resources, geophysics, geochemistry, geochronology, paleontology, and marine geology.
The National Map Viewer (TNM Viewer) is the one-stop destination for visualizing all the latest National Map data. It uses easy to navigate foundational base maps and makes it simple to interact with all our data themes to create your own map.
USGS has compiled existing topographic and geologic maps of the lower 48 states into a single digital tapestry. The new map resembles traditional 3-D perspective drawings of landscapes with the addition of a fourth dimension, geologic time, which is shown in color. This union of topographic texture with the patterns defined by units of geologic time creates a visual synthesis that has escaped most prior attempts to combine shaded relief with a second characteristic shown by color, commonly height above sea level (already implicit in the shaded relief). In mutually enhancing the landscape and its underlying temporal structure, this digital tapestry outlines the geologic story of continental collision and break-up, mountain-building, river erosion and deposition, ice-cap glaciation, volcanism, and other events and processes that have shaped the region over the last 2.6 billion years.