Eons formed our topography
Point 1: Why Are Calvert’s Cliffs Exposed?
The Miocene epoch of geology lasted from 23 to 5.3 million years ago. The middle Miocene was a time of high sea levels worldwide. The fact that we have these marine sediments exposed today, above present sea level, partly reflects that sea levels are generally down from what they were.
Shallow seas, embayments of the Atlantic, episodically covered much of Southern Maryland from about 18 to 20 and eight to 10 million years ago. Sea level...