Cretaceous paleogeography

large inland sea during the mid- to late Cretaceous and the very early Paleogene; split North America into Laramidia and Appalachia; stretched from the Gulf of Mexico to the Arctic Ocean; at its largest, it was 760 m deep, 970 km wide, 3200 km long

large shallow body of salt water of the Mesozoic and Cenozoic Eras

historic ocean