USGS Scientific Investigations Report 2018-5091: Characterization and Occurrence of Confined and Unconfined Aquifers in Quaternary Sediments in the Glaciated Conterminous United States

Figure 7

Select radio button to display desired data overlay. Use slider to control base map opacity.
For best results use Google Chrome.

EXPLANATION

Bedrock lithology

Noncarbonate sedimentary

Carbonate

Noncarbonate metamorphic

Volcanic

Plutonic

Undetermined

Overlain by coarse, stratified
surficial sediments

Areas with insufficient data to map

Hydrogeologic terrane boundaries—Alphanumeric code indicates the
generalized complexity of the hydrogeologic framework in each terrane

Sediment thickness contrast

Major river

Maximum extent of glacial ice

Extent of Late Wisconsinan ice

Figure 7. Generalized bedrock lithology (modified from the Integrated Geologic Map Databases for the United States) and overlying Glacial Environment and Surficial Sediments geodatabase coarse-grained, stratified surficial sediments in the glaciated conterminous United States; surficial geology from Haj and others (2018).

Accessibility FOIA Privacy Policies and Notices

U.S. Department of the Interior | U.S. Geological Survey
URL: http://pubsdata.usgs.gov/pubs/sir/2018/5091/sir20185091_fig07.html
Page Contact Information: GS Pubs Web Contact
Page Last Modified: Thursday, 06-Dec-2018 14:42:04 EST