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

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EXPLANATION

Thickness of unconfined aquifer-material

interval, in meters.

Well count

≥10

6 to <10

3 to <6

0 to 4

>4 to 10

>10 to 25

>25 to 50

>50

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 20A. Thickness of unconfined (water-table) aquifer-material intervals in the glaciated conterminous United States.

U.S. Department of the Interior | U.S. Geological Survey
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Page Last Modified: Thursday, 06-Dec-2018 14:43:49 EST