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

Figure 2

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EXPLANATION

Map Unit (GESS MU)

Alluvial sediment

Outwash sediment

Ice contact sediment

Eolian sediment

Lacustrine sediment

Marine sediment

Till

End moraine

Organic sediment

Residual soil

Soliflucted sediment

Colluvial sediment

Fill

Bedrock

Water

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 2. Glacial Environment and Surficial Sediments (GESS) geodatabase map units (GESS_MU attribute) in the glaciated conterminous United States.

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