Cal Geographic

Trace fossils of Pholad boreholes (Pholadidae/bivalve mollusk/Boring clams) in the sandstone and greywacke cliff face of the MIS5-5e terrace (approx 100-120ka), on the northern Mendocino coast.. and within the geologic Coastal Belt of the Franciscan Complex

And here is a link to the video of our field visit to a fossil Pholad borehole site on the North Coast