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

Figure 2D

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EXPLANATION

Elevation, in meters,
datum is NAVD 88

>1,065 to 2,128

>915 to 1,065

>765 to 915

>615 to 765

>585 to 615

>485 to 585

>425 to 485

>365 to 425

>305 to 365

170 to 305

Driftless Area

Paleozoic Plateau

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

Cambrian-Ordovician aquifer

Glacial Lake Agassiz

Figure 2D. Terranes 1D, 1E, 2B, and 3B in Minnesota, Wisconsin, upper Michigan, northern Illinois, and eastern North and South Dakota in the glaciated conterminous United States.

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