I commented, back in April, my suspicion is that these pillows formed, then sank into unconsolidated sediments of the Astoria Formation. I can imagine pillows forming invasively, that is, basalt forming pillow structures as it intrudes into soft sediment, but it seems like it would necessarily have a more chaotic result than we see here. The pillows are quite regular.
Photo unmodified. July 15, 2014. FlashEarth Location.
Is This Your Hat?
2 years ago