The White Tail Ridge Formation is a geologic formation in Oregon. It preserves fossils dating back to the Paleogene period. The formation records fluvial, deltaic, and shallow-marine deposits along the margin of an Eocene basin of southwestern Oregon. Conglomeratic intervals contain clasts derived from volcanic, plutonic, metamorphic, and sedimentary source terranes associated with tectonic uplift in the Klamath Mountains and adjacent regions.
The formation preserves marine invertebrate fossils, plant material, and carbonaceous deposits indicative of warm, humid Paleogene environments. It is regionally overlain by the Tyee Formation and overlies older lower Eocene strata including the Tenmile Formation. See also List of fossiliferous stratigraphic units in Oregon Paleontology in Oregon
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