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


The Mississippi River Alluvial Plain is a relatively level plain with elevations varying between 100-300 feet except for Crowley’s Ridge with some of its highest points reaching 400-560 feet.  This region contains mostly unconsolidated sediments such as sand, clay, silt, gravel and loess.  To learn more about the geology click here.

View of flat-lyin alluvial plain

View of flat-lying alluvial plain




Loess canyon on Crowleys Ridge

Loess canyon on Crowley’s Ridge




Learn about the Geology of the Mississippi River Alluvial Plain forward arrow


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Arkansas Geological Survey
Vardelle Parham Geology Center
3815 West Roosevelt Road
Little Rock, AR 72204
Phone: 501-296-1877 | Fax: 501-663-7360
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