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

Well count for 5-kilometer grid

1 to 5

6 to 10

11 to 20

21 to 30

31 to 681

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 8. Density of lithologic logs aggregated on a 5-kilometer grid 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 14:42:15 EST