![]() NPS / Nanette Nyce THE FORCE SPECTRUM - Purplehorse Beach ![]() NPS / Nanette Nyce A band of migmatite crosses the C&O Canal from about MM 12.5 - MM 16. In addition to Purplehorse beach, migmatized metagraywacke can be seen next to the towpath along Widewater (MM 12.6). Discussion Question: What are some natural (and humanmade) forces that work together to cause a spectrum of effects, altering the environment? Additional C&O Geology pages: Locks 15-20 | Olmsted Island | Flooding | Devil's Eyebrow | Pothole Alley | Widewater | Lamprophyre Dikes | Mather Gorge | Paw Paw Tunnel | Cumberland CoalReturn to main Rock Talk page. ![]() NPS / Nanette Nyce |
Last updated: April 23, 2021