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

Median thickness to bottom aquifer-material

interval, in meters.

Well count

≥10

6 to <10

3 to <6

0.3 to 5

>5 to 10

>10 to 15

>15 to 20

>20 to 30

>30 to 40

>40 to 50

>50 to 75

>75 to 100

>100

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 17B. Median thickness of bottom aquifer-material interval, estimated from lithologic logs, in the glaciated conterminous United States.

U.S. Department of the Interior | U.S. Geological Survey
URL: http://pubsdata.usgs.gov/pubs/sir/2018/5091/sir20185091_fig17b.html
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Page Last Modified: Thursday, 06-Dec-2018 14:43:39 EST