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

Figure 14B

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EXPLANATION

Probability of penetrating an
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

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 14B. Probability of penetrating at least one aquifer-material interval (at least 3 meters of coarse material) by lithologic logs in the glaciated conterminous United States.

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