Glacial erratic boulders of Snohomish County, Washington
Glacial erratic boulders of Snohomish County are large glacial erratic boulders of rock which were moved to Snohomish County, Washington by glacial action during previous ice ages.
List of boulders
| Airport Boulder, at Martha Lake Airport Park in Martha Lake, said to be "one of the largest glacial erratic boulders in urban King, Snohomish, and Pierce counties",[1] is approximately 20 feet (6.1 m) long on its longest axis and about twice a man's height. The erratic is composed of greenstone,[2] and has long been used for bouldering (rock climbing), with at least four ascent routes.[3][4]
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File:Martha Lake Erratic 2015 1.jpg |
| Edmonds Way erratic
Fraser Valley breccia, 10 by 15 feet (3.0 m × 4.6 m) and 12 feet (3.7 m) high.[5] Lua error in package.lua at line 80: module 'strict' not found. |
File:Edmonds Way erratic 2.jpg |
| Everett Boulder, erratic found 30 feet (9.1 m) underground at downtown construction site, Colby Avenue and Wall Street. 18 feet (5.5 m) long, and 10 feet (3.0 m) high, weighs approximately 300,000 pounds (140,000 kg).[6][7][8][9] The erratic briefly had over one hundred Twitter followers and was eventually reburied.[10]
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| "Granite" is a 6-by-7-by-4.5-foot (1.8 m × 2.1 m × 1.4 m), 30,000-pound (14,000 kg) granite boulder discovered "under a bunch of sticker bushes" during a October, 2015 construction project in Edmonds. After attempts to destroy the boulder resulted in destruction of the power equipment used, the city offered it for free to a city resident who would accept it on their property.[11][12]
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File:Granite, Edmunds, Washington glacial erratic with yardstick.JPG |
| Lake Stevens Monster near Lake Stevens. 34 by 78 feet (10 m × 24 m) and 210 feet (64 m) in circumference. Largest known erratic in Washington State as of 2011[update],[13] and may be largest in the United States (but not North America; see the Alberta Big Rock).
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File:Lake Stevens Monster 2015b.jpg |
| Longview Boulder found in a Gold Bar gravel mine; five times the height of a man.[14] Blasted and removed.
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| Unnamed erratics near Market Place road in Lake Stevens. Largest is unusual pink granite, approximately 12 by 20 feet (3.7 m × 6.1 m) in size, and 10 feet (3.0 m) tall.[15]
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File:Market Street erratics.jpg |
References
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- Washington glacial erratics project at University of Washington dept. of earth and space sciences
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Glacial erratics in Washington state
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