Although in my 31 years as a ranger on Mount Tam, I have passed this rock outcrop on a non-system route (social trail) many times, I had never looked at it closely enough to realize it was radiolarian chert #mttam #geology #franciscancomplex #platetectonic #naturephotography

Rodeo Beach has very interesting geology, if you’re into that type of thing #rodeobeach #marinheadlands #franciscancomplex #geology #ggnra #goldengatenationalrecreationarea #naturephotography

Shell Beach is world renowned by geologists for its exceptional diversity of rock types found within the Franciscan Complex. #shellbeach #franciscancomplex #geology #sonomacountycoast #sonomacoast #sonomacoaststatepark #castateparks #americasstateparks #naturephotography #landscapephotography

Close up of Blueschist at Turtle Rock #ringmountain #ringmountainprserve #turtlerock #franciscancomplex #geology #blueschist #tiburon #marincountyopenspace #naturephotography