USGS Data Series 1090: Hydrogeologic Framework for Characterization and Occurrence of Confined and Unconfined Aquifers in Quaternary Sediments in the Glaciated Conterminous United States

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EXPLANATION

Elevation, in meters,
datum is NAVD 88

>2,150 to 3,284

>1,875 to 2,150

>1,650 to 1,875

>1,450 to 1,650

>1,250 to 1,450

>1,025 to 1,250

>800 to 1,025

>550 to 800

>250 to 550

0 to 250

Glacial Lakes

Area inundated by Glacial Lake Missoula floods

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

Cordilleran ice sheet

Figure 10F. Terrane 1G in Washington, Idaho, and western Montana in the glaciated conterminous United States.

U.S. Department of the Interior | U.S. Geological Survey
URL: http://pubsdata.usgs.gov/pubs/ds/1090/ds1090_fig10f.html
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Page Last Modified: Monday, 26-Nov-2018 14:15:46 EST