Become a member and save up to 20% on your program registration price! Join today If you are already a member, log in to access your member price. The Backstory of Washington, D.C.'s Bedrock Evening Lecture/Seminar Tuesday, July 8, 2025 - 6:45 p.m. to 8:00 p.m. ET Code: 1L0643 Location: This online program is presented on Zoom. Select your Registration Login $20 Member 0 1 2 3 4 5 6 7 8 9 10 $25 Gen. Admission Adding to your cart... Add to cart Log in to add this program to your wishlist! A 10% processing fee will be applied at checkout. Resize text Igneous dikes at the upstream end of Mather Gorge show offset that may indicate a fault beneath the Potomac River (Photo: Callan Bentley) 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. General Information View Common FAQs and Policies about our Online Programs on Zoom.
