Trenched spurs and the Ephrata boulders are some of the unusual landforms in this area, which also includes the Frenchmen Hills and the Cheney-Palouse Tract as well as the Drumheller Channels through which Crab Creek flows.
The 1979 Penrose Prize was given to the man who correctly postulated the origin of this region, J. Harlan Bretz. Trenched spurs and the Ephrata boulders are some of the unusual landforms in this area, which also includes the Frenchmen Hills and the Cheney-Palouse Tract as well as the Drumheller Channels through which Crab Creek flows. Located south of the Okanogan Highlands, this area has Wallula Gap near its end, and it also includes Sun Lakes State Park, where a three-mile-wide section of plucked columnar basalt known as Dry Falls is located at the head of the Grand Coulee. Formed by the emptying of glacial Lake Missoula approximately 12,000 years ago, for 10 points, identify this large region in Eastern Washington state known for its large-scale fluvial topography.
The 1979 Penrose Prize was given to the man who correctly postulated the origin of this region, J. Harlan Bretz.
The Channeled Scablands