Local ‘grammer @mdwidget fills us in:
According to my Geology of the San Francisco Bay Region handbook, this is Lower Tertiary sedimentary rocks, including sandstone and shale, which started out horizontally as sand and mud on the ocean floor, now tilted and folded as to be nearly vertical. As seen on the #devilsslidetrail #california #bayarea #geology [link]
Trippppy man.
Now let’s listen to a great Bob Dylan song:
