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The Sedimentology, Petrology, And Tectonic Significance Of The Middle Eocene Flattery Breccia, Lyre Formation, Northwestern Olympic Peninsula, Washington, Alice Benkovich Shilhanek

WWU Graduate School Collection

The Flattery breccia, an informally designated unit within the middle Eocene Lyre Formation, consists of sedimentary breccia and conglomerate exposed at Cape Flattery, located at the northwestern point of the Olympic Peninsula, Washington. The Flattery breccia was deposited during the late Narizian, approximately 44 to 42 Ma.

The boulder- through sand-size detritus of the Flattery breccia and western Lyre Formation, which changes in texture along strike, were deposited by sediment- gravity flows, such as surging high-density turbidity currents and sandy debris flows. Interfingering alluvial fan-deltas, interfingering lobes of coarse detritus on a submarine fan, or resedimented wedges of coarse-grained detritus …