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

Figure 4

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EXPLANATION

Hydrochemical region

(from Arnold and others, 2008)

Midwestern agricultural region

Urban-Influenced region

Northern and Great Lakes forested region

Western agriculture and grassland region

Mountain and coastal forested region

Unclassified

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. Hydrochemical regions in the glaciated conterminous United States; regions delineated by Arnold and others (2008) from a statistical analysis of water-quality data. Map is available at https://doi.org/10.3133/sir20185091.

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