In contrast to much of the sedimentary rock along this portion of the coast, I left Boiler Bay thinking I'd seen no evidence of Miocene Columbia Basalt Flows into the area. But looking at some of these photos, such as the one above, I was probably mistaken. It looks like many of the rocks to the ENE across the bay are black CRB's, not beige Astoria Formation. In fact, looking carefully, I thinking I'm seeing a clastic dike cutting into one of the flows:
I don't know if this area is accessible, and this was on the higher end of the tide, but it might be interesting to try to get at this area.