- 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.
- Glacial erratic boulders of Island County, Washington (Wikipedia)
Glacial erratic boulders in Island County are a remnant of the Pleistocene glaciation that created Puget Sound and transformed the surfaces of what are now Island County’s main landmasses: Whidbey Island and Camano Island. South of Deception Pass, the two islands’ surfaces and beaches are completely composed of glacial till. Abundant glacial erratic boulders lie on the islands, their beaches, and under the near-shore waters.
- Glacial erratic boulders of King County, Washington (Wikipedia)
Glacial erratic boulders of King County are large glacial erratic boulders of rock which were moved into King County, Washington by glacial action during previous ice ages.
- 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”, is approximately 20 feet (6.1 m) long on its longest axis and about twice a man’s height.
- The [Airport Boulder] erratic is composed of greenstone [greenschist]
- Fraser Valley breccia, 10 by 15 feet (3.0 m × 4.6 m) and 12 feet (3.7 m) high.
- 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).
- 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, and may be largest in the United States (but not North America; see the Alberta Big Rock).