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Lower Dakota Aquifer Geologic Maps

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Surficial relief in the 16 county study area. Landform regions in NW Iowa.
Thickness of the unconsolidated Quaternary materials in NW Iowa. Elevation of the bedrock surface.
Bedrock Geology of the study area. Thickness of Cretaceous strata above the Lower Dakota Aqifer.
Geologic map of the sub-Cretaceous surface. Location of aquifer tests conducted in the Lower Dakota Aquifer.

Thickness of Lower Dakota Aquifer

 

Depth to the top of sub-Cretaceous rocks.
Depth to the top of the Lower Dakota aquifer. Depth to the bottom of the Lower Dakota aquifer.
Elevation of the top of sub-Cretaceous rocks. Elevation of the top of the Lower Dakota Aquifer.
Elevation of the bottom of the Lower Dakota Aquifer.