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AGS / Education / Geology Resources / Physiographic Regions / Mississippi River Alluvial Plain / Geology

The geology of the Mississippi River Alluvial Plain is characterized by unconsolidated flat-lying alluvium from present day and older streams, overlying poorly consolidated Tertiary formations that are dipping slightly to the south.

Quaternary terrace sand and gravels on top of Crowleys Ridge

Quaternary terrace sand and gravels on top of Crowley’s Ridge

Tertiary Deposits

Tertiary deposits

See Mississippi Plain Geology on map

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Arkansas Geological Survey
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