Great Plains Cenozoic Fossils Display

As the Rocky Mountains began to form in Late Mesozoic and Early Cenozoic, vast amounts of sand, gravel and silt were carried away by streams and spread over the surrounding region. The Great Plains Province adjacent to the Rockies on the east was vobered by thick blankets of this stream deposited debris. Fossil remains of land animals are numerous in these deposits. In many cases these fossils occur in "pockets" with numerous individuals crowded together. One might interpret this as representing watering places where thirst-crazed animals gathered in exhausted conditions during periods of drought, Background image avaible at: https://www.livescience.com/40352-cenozoic-era.html