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The Channeled Scablands are a relatively barren and soil-free region of interconnected relict and dry flood channels, coulees and cataracts eroded into Palouse loess and the typically flat-lying basalt flows that remain after cataclysmic floods within the southeastern part of Washington state. [1][2] The Channeled Scablands were scoured by more ...
Setting. Giant current ripples are a geomorphological phenomenon associated with channeled scablands. Scablands form when lakes dammed off by glaciers suddenly burst through their dams and empty their contents in giant flooding events. They are found in the Altai Mountains of Russia, [3] as well as in the Columbia Plateau [4] of the Pacific ...
Bretz coined the term Channelled Scablands in 1923 to describe the area near the Grand Coulee, where massive erosion had cut through basalt deposits. [7] The area was a desert, but Bretz's theories required cataclysmic water flows to form the landscape, for which Bretz coined the term Spokane Floods in a 1925 publication. [8]
Dry Falls — at the heart of Eastern Washington’s channeled scablands of dry, connected flood channels and deep ravines — is the only Washington or Oregon site on the new heritage sites list.
Bretz defended his theories, which kicked off an acrimonious 40-year debate over the origin of the Scablands. Both Pardee and Bretz continued their research over the next 30 years, collecting and analyzing evidence that led them to identify Lake Missoula as the source of the Spokane flood and creator of the channeled scablands. [6] [7]
Examples of scabland features, such as large kolk-excavated potholes, provide evidence of the tremendous powers of the floods. [7] There is a unique character to the Drumheller Channels; unlike most other Channeled Scabland zones, no single centralized channel or major cataracts were formed.
ISBN 978-1-879628-27-4. Sediment deposited by the lake with a hammer for scale. Lake Missoula was a prehistoric proglacial lake in western Montana that existed periodically at the end of the last ice age between 15,000 and 13,000 years ago. The lake measured about 7,770 square kilometres (3,000 sq mi) and contained about 2,100 cubic kilometres ...
The Channeled Scablands ecoregion contains the coulees and Channeled Scablands of Washington carved out by the cataclysmic Missoula floods, from Wenatchee to Spokane, including public land within the Lake Roosevelt National Recreation Area and Wenatchee National Forest.