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

Figure 50B

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EXPLANATION

Conditional probability of penetrating a confined

aquifer-material interval,

in percent

Well count

≥10

6 to <10

3 to <6

0 to 20

>20 to 40

>40 to 60

>60 to 80

>80 to 100

Aquifer-material
interval unlikely

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 50B. Conditional probability that the interval, if penetrated by a lithologic log, is a confined aquifer in Illinois and Indiana in the glaciated conterminous United States.

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