This boulder was carried to this location around 20,000 years ago. During the last ice age, scores of cataclysmic floods rushed through eastern and central Washington. In their wake were left innumerable canyons and coulees, as well as debris such as this.
This rock is near to Moses Coulee – a canyon system whose origins are a bit of a mystery among geologists. While most flood-related coulees in this area can be traced from one bend of the Columbia River to the other, Moses Coulee seems to start almost out of nowhere. Further, its middle section fans out and jogs to the right before forming another deep canyon.
The Douglas Creek area, where this photo was taken, is near the head of the lower portion of Moses Coulee. It’s where the flood’s path jogged back to the left in nearly a right angle.
The boulder was likely tumbled by the flood waters down Moses Coulee from some location a bit further north. It came to rest where it is probably because of the backwaters formed by the flood fanning out and backing up due to the narrowing at the jogs to the right and left.
‘In Their Season’
Camera: Mamiya m645J (1979)
Lens: Mamiya-Sekor C 45mm f/2.8
Film: Kodak Vericolor 160; x-09/83; 50iso
Process: DIY ECN-2
Near Douglas Creek Falls, Douglas County, Washington