English: Pillow structures preserved in greenschist-facies metamorphosed basalts of the Franciscan Complex, Black Sands Beach, Marin Headlands, California. Field of view is approximately 2 m wide.
Date
Source
Private collection, American Geophysical Union.
Author
Photo was taken by Nam Thai, photographer under contract for the American Geophysical Union. As an editor of a field trip guide published by the American Geophysical Union, I have received express written permission from the American Geophysical Union to publish this photo to Wikimedia Commons for use in Wikipedia articles.
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