Scenic Trips to the Northwest's Geologic Past
1 primary work
Book 2
Cataclysms on the Columbia
by John Eliot Allen, Marjorie Burns, and Sam Sargent
Published 1 March 1987
The formation of the Grand Coulee remained a mystery for many years, until J Harlen Bretz proved that the Columbia River basin was the site of huge floods 15,000 years ago that created the landscape we see today.