In addition to the crumbling rock, the San Andreas Fault runs right along the park in a line from Bolinas Bay to Tomales Bay.  A National Park Service Geologic Resources Inventory Report issued in 2018 states, "Point Reyes National Seashore stands in stark contrast to the surrounding California mainland as a kind of 'geologic island.' Arguably one of the most geologically active parks in the national park system, the entire peninsula was transported along faults to its current location and continues to move northwest to this day along the San Andreas Fault."





See also:
Adam P. Young. "Decadal-scale coastal cliff retreat in southern and central California." Geomorphology,
Volume 300, 2018, Pages 164-175.

Rebecca Port. "Point Reyes National Seashore: Geologic resources inventory report." National Park Service, Oct. 2018.