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
edit| 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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| Edmonds Way erratic
Fraser Valley breccia, 10 by 15 feet (3.0 m × 4.6 m) and 12 feet (3.7 m) high.[5] |
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| 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] The erratic briefly had over one hundred Twitter followers and was eventually reburied.[9] | 
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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 an 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.[10][11] | 
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| 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],[12] and may be largest in the United States (but not North America; see the Alberta Big Rock). | 
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| Longview Boulder found in a Gold Bar gravel mine; five times the height of a man.[13] 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.[14] | 
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See also
editReferences
edit- ^ Martha Lake Airport Park, Snohomish County, Washington, retrieved 2015-04-05
- ^ David C. McConnell (March 8, 2012), History of Martha Lake Airport Community Park and "Big Rock", Snohomish County Parks Department
- ^ Snohomish County Parks e-Newsletter, Snohomish County, Washington, April 2012
- ^ Jacob Smith (October 31, 2012). "Airport Boulder". SummitPost.org.
- ^ Bill Sheets (May 31, 2011), "Big boulder in Edmonds one of many left by long-gone glaciers", The Everett Herald, archived from the original on 2015-06-21
- ^ Chris Winters (November 20, 2014), "Giant rock, possibly 2 million years old, found at construction site", Everett Herald
- ^ Giant prehistoric rock found at Everett construction site, KIRO-TV, November 20, 2014
- ^ Sean Breslin (November 22, 2014), Massive Glacial Boulder Unearthed at Construction Site in Everett, Washington, Weather.com
- ^ Chris Winters (November 24, 2014), "Boulder reburied at Everett hotel construction site", Everett Herald
- ^ Payne, Bob (October 23, 2015), "Would you like a rock for your yard? A really, really big rock?", The Seattle Times
- ^ Sharon Salyer (October 23, 2015), "Huge rock can be yours, but there are a few rules set in stone", Everett Herald
- ^ Dave Tucker (July 18, 2011), "The Lake Stevens monster- largest erratic in Washington. Largest in the US?", Northwest Geology Field Trips
- ^ "Longview Boulder Blast, Snohomish County, Washington" (PDF), Bulletin, SubTerra Inc., B182
- ^ Dave Tucker (July 21, 2011), "True granite: an unusual granite erratic in Lake Stevens", Northwest Geology Field Trips
Further reading
edit- Thompson, Evan (May 8, 2018). "Geologic wonders offer awe-inspiring sights, a glimpse into the past – Venture out to see glacial erratics around Snohomish County and on Whidbey Island". Everett Herald.
External links
edit- Washington glacial erratics project at University of Washington dept. of earth and space sciences
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