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Sedimentary Petrology, Depositional Environment, And Tectonic Implications Of The Upper Eocene Quimper Sandstone And Marrowstone Shale, Northeastern Olympic Peninsula, Washington, William E. (William Ernst) Rauch

WWU Graduate School Collection

The Upper Eocene (Refugian) Quimper Sandstone and overlying Marrowstone Shale document approximately 300 meters of sediment deposited in a tectonically active, shallow marine area during a transgression. The Quimper Sandstone and Marrowstone Shale can be roughly divided into three facies, representing deposition from outer shore face and inner shelf to offshore or outer shelf.

Petrographic analysis of the Quimper Sandstone and Marrowstone Shale indicates geography and hydrodynamic conditions were responsible for a slight petrologic trend in composition such as more feldspar and lithic grains in the lower energy facies. The sandstones are lithic and feldspathic arenites and wackes with abundant …