Baldy Mountain member of [Davis Canyon formation]. Named as lower member of formation. Underlies Buck Island member (new); overlies Round Mountain member of Little Valley formation (both new). Upper Jurassic and Cretaceous section, about 40,000 feet thick, consists of sequences of shale and silty shale which alternate with sequences of sandstone. Age is Late Jurassic[?] or Cretaceous[?].
Occurs in the Morgan-Wilbur area in Lake, Yolo, and Colusa Cos., northern CA.
[Misprint in Lawton's dissertation abstract (1956, Dissert. Abs., v. 16, no. 10, p. 1885). Author used term Davis CREEK Formation intsead of Davis CANYON, the name used in thesis manuscript.]

Source: US geologic names lexicon (USGS Bull. 1200, p. 205).

Named lower member of Davis Canyon Formation by Lawton (1956, PhD thesis). Recognized in Morgan-Wilbur area in Lake, Yolo, and Colusa Counties, northern California. Consists of sandstone with minor mudstone. Composite columnar section of northern Great Valley sequence shows Baldy Mountain underlying "Buck Island Member" of "Davis Canyon Formation" and overlying "Little Valley Formation" of Lawton (1956). Age is Early Cretaceous (Aptian).
[Misprint in Lawton's dissertation abstract (1956, Dissert. Abs., v. 16, no. 10, p. 1885). Author used term Davis CREEK Formation intsead of Davis CANYON, the name used in thesis manuscript. Davis Creek was listed in the Keroher Lexicon (US geologic names lexicon, USGS Bull. 1200).]

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