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Iron oxide coatings from oxic parts of the aquifer give sand a red hue

By Water Resources Mission Area
Two hands hold red oxidized soil
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Detailed Description

Redox conditions in the glacial aquifer system can be apparent from the color of the sediments.  Iron-oxide coatings gives sand from oxic parts of the aquifer its rusty reddish hue.

Sources/Usage

Public Domain.

Water Quality in Principal Aquifers of the United States, 1991–2010