Skip Links

USGS - science for a changing world

Scientific Investigations Report 2021-5069

Interactive Map 6: Hydrogeologic settings in the contiguous United States, showing principal aquifer and secondary hydrogeologic region names.

Use the vertical slider to control base map opacity.
For best results use Google Chrome.



Interactive Map 6. Hydrogeologic settings in the contiguous United States, showing principal aquifer and secondary hydrogeologic region names. The hydrogeologic settings are identified on the maps by a letter indicating if the hydrogeologic setting is a principal aquifer (P) or a secondary hydrogeologic region (S). The numbers match those used in Lovelace and others (2020) and Belitz and others (2019). Abbreviations in the secondary hydrogeologic region names include: K-Cretaceous, PZ-Paleozoic, Q-Quaternary, S-Sedimentary, T-Tertiary, V-Volcanic, and X-Crystalline. Hydrogeologic settings that have an AV suffix which lie north of the maximum glacial extent have coarse glacial overlying sediment and those to the south have alluvial valley overlying sediment. The hydrogeologic setting are shown by geographic areas of the conterminous U.S. in appendix figure 1.

Accessibility FOIA Privacy Policies and Notices

USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: Contact USGS