Tukwila Formation

Tukwila Formation
Stratigraphic range: Bartonian
TypeGeological formation
Location
RegionWashington
CountryUnited States
Type section
Named forTukwila, Washington

The Tukwila Formation is a geological formation in King County, Washington within the Puget Group. It is named after the Tukwila area, which is close to the formation. The formation consists of various fossils of marine origin.

The Tukwila Formation is mainly composed of andesitic to dacitic volcanic sandstone, siltstone, shale, tuff breccia, tuff, lahar, and carbonaceous shales. The tuff breccia has an approximate age of 42 Ma.

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