The area consists primarily of Tertiary sedimentary and volcanic rocks and Pleistocene glacial and interglacial unconsolidated sediments.

geology of

Snohomish County, Washington

path on GitHub

https://github.com/davepinch/pinchy.cc/blob/master/content/topics/geology/topics/geology-of-washington/ger_ofr73-1_geology_south_snohomish_co_pt1.pdf/snippet-introduction-4-1.md

random

snippet of

Preliminary Report on the Geology of Southern Snohomish County (PDF) The map area includes eighty-five square miles in South Snohomish County southeast of Everett, bounded on the west by Interstate 5, on the south by Highway 405 and the Snohomish-King County boundary, on the east and north by the Snohomish River floodplain.

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