Geology of Marin Headlands and Rodeo Beach

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Marin Headlands and Rodeo Beach have some amazing geology that involves volcanoes, plate tectonics, and lots and lots of dead plankton. Learn how the beautiful pebbles of Rodeo Beach tell a 200 million year long story!

Best place to see basalt: south side of Rodeo Beach
Best place to see chert: Golden Gate Bridge Overlook (turn around)
Best place to see greywacke: north side of Rodeo Beach

Sources and other information:

Marin Headlands pillow basalt video:    • Virtual Field Trip: Pillow lava in the Mar...  
Amazing accretionary zone sand experiment credit: Judith Hubbard; video:    • Sandbox Experiment 8 (gentle dip, variable...  
Underwater eruption credit: Javier Rodríguez Jauregui; video:
   • Lava under the ocean.  
California subduction credit: IRIS Earthquake Science; video:    • Cascadia Subduction Zone—What can the land...  

This excellent field trip guide by Mary Leech: Geology of the Golden Gate
National Recreation Area in the Marin Headlands, and Ring Mountain, Tiburon http://funnel.sfsu.edu/courses/geol42...

Blake, M. C., David Lawrence Jones, and Russell Walter Graymer. Geologic map and map database of parts of Marin, San Francisco, Alameda, Contra Costa, and Sonoma counties, California. US Department of the Interior, US Geological Survey, 2000.
Graymer, Russell Walter, B. C. Moring, G. J. Saucedo, C. M. Wentworth, E. E. Brabb, and K. L. Knudsen. Geologic map of the San Francisco Bay region. US Department of the Interior, US Geological Survey, 2006.
Greene, H. G., S. Y. Johnson, M. W. Manson, S. R. Hartwell, C. A. Endris, T. R. Bruns, G. R. Cochrane, and S. A. Cochran. "Offshore and onshore geology and geomorphology, offshore of San Francisco map area, California, sheet 10." California State Waters Map Series—Offshore of San Francisco, California 1068 (2015): 39.
Wahrhaftig, Clyde. "Structure of the Marin Headlands block, California: A progress report." (1984): 31-50.