This data set represents the extent of the Northern California volcanic-rock aquifers in California.

This data set represents the extent of the Central Valley aquifer system in California.

This data set represents the extent of the Basin and Range aquifers in the states of California, Utah, Arizona, and Nevada.

This data set represents the extent of the Basin and Range carbonate-rock aquifers in the states of Idaho, Utah, Arizona, Nevada, and California.

This data set represents the extent of the Volcanic and sedimentary-rock aquifers in the states of Montana, Wyoming, Idaho, Nevada, California, Oregon, and Washington.

This data set represents the extent of the Pacific Northwest basin-fill aquifers in the states of Washington, Oregon, California, and Idaho.

This data set represents the extent of the Texas coastal uplands aquifer system in Texas.

This data set represents the extent of the Southern Nevada volcanic-rock aquifers in Nevada.

This data set represents the extent of the Miocene basaltic-rock aquifers in the states of Idaho, Oregon, Washington, California, and Nevada.

The U.S. Geological Survey (USGS) entered into a cooperative study with the California Department of Water Resources and the Ramona Band of Cahuilla to characterize the hydrogeology of the Cahuilla Valley and Terwilliger Valley groundwater basins and surrounding water-bearing units, with the ultimate goal of developing a calibrated integrated hydrologic model to manage the groundwater supplies on a sustainable basis. A three-dimensional geologic framework model (GFM) was developed to quantify the structural geometry and distribution of water-bearing units in the groundwater basins, using borehole lithology and hydraulic information, geologic maps, and gravity-derived depth-to-basement information. This dataset includes (1) tabular data of selected boreholes with their location and construction information, (2) borehole lithology information, (3) a geographic information systems (GIS) shapefile of a cellular array containing interpolated elevations and thicknesses of modeled geologic units from the GFM in the format of a polygon feature class, (4) and a table of summary textural classes for the alluvial fill unit from borehole logs and summary textural classes used in geologic framework model.