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Lower Tertiary aquifers

By Water Resources Mission Area
Map showing the extent of the Lower Tertiary aquifers
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Detailed Description

The major aquifers of the Northern Great Plains aquifer system are sandstones of Tertiary and Cretaceous age and carbonate rocks of Paleozoic age. These aquifers, along with regional confining units that separate some of them, form one of the largest confined aquifer systems in the United States. Beds of lignite and subitumious (soft) coal are common throughout the Lower Tertiary aquifers.

Sources/Usage

Public Domain.