Painted Hills, Painted Hills Unit, John Day Fossil Beds Nat'l Monument

Geology 101: Northeastern Oregon


To paraphrase the great John McPhee in¬†Assembling California, most of Oregon, like most Oregonians, originally came from somewhere else. Specifically, the Wallowa, Baker, Izee and Olds Ferry Terranes originated out in the Pacific Ocean and over the course of millions of years and the inexorable forces of plate tectonics they collided with the North American…