USGS Data Series 1090: Hydrogeologic Framework for Characterization and Occurrence of Confined and Unconfined Aquifers in Quaternary Sediments in the Glaciated Conterminous United States

Figure 4

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EXPLANATION

Bedrock lithology

Non-carbonate sedimentary

Carbonate

Non carbonate 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 4. 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.

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