The Inner Cretaceous Seaway

Wednesday, June 22, 2011

Looking West: A sod house is shown in the foreground and flanked by an ancient sediment deposits that contain windblown sand and volcanic ash.


We headed south to Nebraska to complete our study of the geologic history of this region of the United States. One of the common denominators throughout our journey was a feature referred to as The Inner Cretaceous Seaway. The Cretaceous period represents the final chapter in the era of the dinosaurs. It also represents a time when a sea existed from the Gulf of Mexico to the Arctic Ocean, thereby separating the North American continent. Many of the landforms we investigated had connections to the ancient seaway and the environments that influenced their geology.