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Subsurface information obtained during a recent investigation has been combined with information from previous investigations to establish a stratigraphic framework for the Cretaceous rocks of southwestern Minnesota. This new framework makes possible the reconstruction of Late Cretaceous (Cenomanian to Campanian) paleogeography.

In southwestern Minnesota, the Greenhorn cyclothem is partly represented by an eastward transition from mostly marine strata of shelf and nearshore environments to mostly nonmarine strata of fluvial and deltaic depositional environments. Rocks of subsequent depositional cycles are extensively eroded and display less variation in depositional environment. The Upper Cretaceous sequence has been mapped as nine lithostratigraphic units. The...

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