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Cretaceous sedimentary rocks in the Mitchell inlier of central Oregon accumulated in a forearc basin within a poorly understood part of the North American Cordillera. Sedimentary units are broadly to tightly folded and include the Albian Hudspeth Formation (marine mudstone and turbidites) and the Cenomanian Gable Creek Formation (submarine-fan conglomerate and sandstone). Previous and new mapping in the Toney Butte area reveals interference of the NE-trending Mitchell anticline and the NW-trending, basement-cored Toney Butte anticline. The entire ∼1.2–1.4 km thick Main Mudstone member of the Hudspeth Formation pinches out across the Toney Butte anticline, and the overlying Gable Creek Formation...

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