Large fossilized aquatic birds called "Hesperornis" and "Ichthyornis", found in western Kansas, indicate that the shallow sea wasal plain lying alongside the lower Mississippi River may be associated with a shallow sea which had existed 6 thousand years ago.
Large fossilized aquatic birds called "Hesperornis" and "Ichthyornis", found in western Kansas, indicate that the shallow sea was rife with fish. The coastal plain lying alongside the lower Mississippi River may be associated with a shallow sea which had existed 6 thousand years ago.