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Todd-Mellette County Study map
Project Description

This is an investigation of the geology and water resources of a two county area in south central South Dakota. The stratigraphy, sedimentology, and surficial geology are the main areas of emphasis. Surface deposits include:
  • Miocene and Pleistocene sand dunes
  • Miocene Ogallala Group sands and silts
  • Oligocene Arikaree Group siltstones
  • Oligocene and Eocene White River Group claystones and late Cretaceous Pierre Shale.

Shallow ground water resources are often of exceptionally good quality.