Please Note: This program has a rescheduled date (originally July 8, 2025).
The capital of the United States is underlain by rocks that have a history as turbulent as that of the nation itself. Geologist Callan Bentley explores the variety of rocks found in Washington, D.C., area, and what they tell us about geologic events stretching back a billion years into Deep Time.
He discusses dirty sediments dumped in an extinct ocean, granites at the foot of Andean-style mountains, and rushing rivers in which dinosaurs swam. Bentley also covers very young faults in the area and explores the implications for earthquake risk.
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