Background

Locality of the Excavation”

            Harding County, South Dakota, United States

Geologic Age”

            Late Cretaceous Maastrichtian” Hell Creek Formation: 65 million years ago

Geographic and Geologic Settings”

            “The Hell Creek Formation of Montana and the Dakotas represents deposition of fluvial non-marine sediments along the eastern margin of an interior seaway that once stretched from what is now the Gulf of Mexico to the Arctic Ocean. Hell Creek Formation sediments are primarily sandstones, siltstones and mudstones that represent channel and floodplain depositional settings.