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

Quaternary sediment thickness, in meters

Well count

≥10

6 to <10

3 to <6

0 to 10

>10 to 25

>25 to 40

>40 to 60

>60 to 80

>80 to 100

>100 to 150

>150 to 250

>250

Areas where thickness of Quaternary sediment is not currently mapped

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 12A. Thickness of Quaternary sediment, 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_fig12a.html
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Page Last Modified: Thursday, 06-Dec-2018 14:42:48 EST