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

Figure 14A

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EXPLANATION

Median number of aquifer-material intervals

Well count

≥10

6 to <10

3 to <6

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 14A. Median number of intervals of aquifer-material (at least 3 meters of coarse material) penetrated by lithologic logs in the glaciated conterminous United States.

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