Pg. 3 (fig. 2), 5-7. Osborne Canyon Formation of Owens Valley Group. Calcareous mudstone, bioclastic limestone, limestone conglomerate, and minor calcareous siltstone. Most characteristic features are abundance of mudstone and presence of coarse-grained limestone. Generally slope-forming. At type section subdivided into 3 informal members (A-C, ascending), total thickness 346 m. Disconformably overlies Tihvipah Limestone; conformably underlies Darwin Canyon Formation (new) of Owens Valley Group. Age is Early Permian (middle Wolfcampian) based on fusulinids.
Type section: about 7 km south of Panamint Springs, high on east side of Argus Range above Osborne Canyon, in SW/4 sec. 13, T. 19 S., R. 41 E., Panamint Butte 15-min quadrangle, Inyo Co., eastern CA. Named from Osborne Canyon, the northernmost major canyon on east side of Argus Range.

Source: Publication; GNU records (USGS DDS-6; Menlo GNULEX).

Pg. 3 (fig. 2), 13-14; . Osborne Canyon Formation of Owens Valley Group. Silty calcareous mudstone, very fine-grained calcareous sandstone, siliceous mudstone or chert, conglomeratic limestone, and minor calcarenitic limestone. The fine-grained rocks, which dominate the lower half of the formation, form recessive, generally pink or purple slopes, whereas the more resistant conglomeratic and calcarenitic limestone beds form dark-gray ledges that characterize the upper half of the formation. In map area subdivided into 4 informal members (1-4, ascending), total thickness about 150 m. Disconformably overlies Bird Spring Formation; conformably underlies Darwin Canyon Formation of Owens Valley Group. Age is Early Permian (Cisuralian; Sakmarian to Artinskian; [middle to late] Wolfcampian), based on conodonts and ammonoids.

Source: Publication.