How do you tell the story of a river that's tens of millions of years in the making? In Episode 79, I sit down with Dr. Roy Van Arsdale, Professor Emeritus at the University of Memphis, to trace the deep geologic history of the Mississippi River—and it's a more dynamic ride than you might expect.
We go back 100 million years, to a time when rivers in North America generally flowed north and west, then follow the dramatic forces that reversed the continent's plumbing, including a drifting hot spot that lifted part of a mountain range nearly two miles, which then eroded and sank, creating a trough for the river we call the Mississippi. Roy talks about the pre-Ice Age river that was much bigger than today’s Mississippi (and why it carried more water) and explains how glaciers rerouted the river's course. He also describes one of his first studies where he learned how bald cypress tree rings in Reelfoot Lake still bear witness to the New Madrid earthquakes of 1811–12. We even peer into the river's future, describing how uplift that is still in progress will likely change the future Mississippi River, as well as ongoing seismic risks.
If you've ever wondered how America's greatest river came to be, this conversation is for you. Listen wherever you get your podcasts, or find show notes at MississippiValleyTraveler.com/podcast.
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