The southerly hook of Point Reyes forms Drakes Bay (after Sir Francis). Drakes Beach lies along its northern shore and is an elegant curve of high bluffs, broken by a few small barriers and a couple of larger spits.
AERIAL VIEW
I believe the bluffs are Miocene siltstones and sandstones of the Purisma Formation. There is a wonderful planed-off platform at the base of the cliffs. Wave-cut platforms - shore platforms, more generally - have generated plenty of research and speculation. I suspect this one reflects some combination of modern waves, historic uplift?, and lithologic variation - but that's mainly a guess. The sun was setting and we had to get back to the city for dinner - so much for more exploration.
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