The Tukwila Formation is a geological formation is King county, Washington within the Puget Group. It is named after 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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