geological sketch map I posted Monday has reorganized current understanding and nomenclature of these rocks. For example, the sandstone could have logically been demoted to "member" status in the larger and more extensive Astoria Formation. It's source and environment are probably very similar to the latter formation, with the only real distinction being that it was deposited after a basalt flow reached the area.
Photo unmodified. July 10, 2012. FlashEarth location.
Is This Your Hat?
2 years ago