S2#32: The Cretaceous Interior Seaway of North America

This video transcript from Myron Cook details a geologist's explanation of the Cretaceous Interior Seaway, a vast body of water that once divided North America. The geologist uses various geological formations, such as shale deposits and sandstone layers, to map the Seaway's extent and depth. He examines fossil evidence, particularly ammonites and volcanic ash layers, to establish the Seaway's age and duration (approximately 40 million years). Furthermore, the video connects the Seaway's sedimentation processes to the formation of the Great Plains and the Mesa Verde ruins. Finally, the speaker explains how the Seaway's eventual disappearance impacted the surrounding landscape and its inhabitants. SOURCE:Myron Cook : YouTube