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

Figure 2C

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EXPLANATION

Elevation, in meters,
datum is NAVD 88

>515 to 650

>450 to 515

>400 to 450

>350 to 400

>300 to 350

>275 to 300

>250 to 275

>215 to 250

>150 to 215

80 to 150

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

High Plains aquifer

Figure 2C. Terranes 1C, 2C, 2D, 3C, and 4B in Iowa, southern Minnesota, southeastern South Dakota, northern Missouri, eastern Nebraska and Kansas, and a small area of western Illinois in the glaciated conterminous United States.

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