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

Figure 6

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EXPLANATION

Textural classification

Unstratified sediment

Mostly sandy till

Sandy-silty till

Mostly silty till

Silty-clayey till

Mostly clayey till

Mostly organic till

Colluvial sediments
and residual soils

Stratified sediment

Other

Mostly sandy

Sandy-silty

Mostly silty

Silty-clayey

Mostly clayey

Bedrock

Water

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 6. . Textural classification of Glacial Environment and Surficial Sediments geodatabase map units in the glaciated conterminous United States.

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