Cedar Ridge
Basic information
Sample name: Cedar Ridge
Sample aka: Badwater Creek locality 19
Reference: T. Setoguchi. 1978. Paleontology and geology of the Badwater Creek area, central Wyoming. Part 16. The Cedar Ridge local fauna (late Oligocene). Bulletin of the Carnegie Museum of Natural History 9:1-61 [ER 4170]
Geography
Country: United States
State: Wyoming
County: Natrona
Coordinate: 43.34° N, -107.48° W
Coordinate basis: stated in text
Scale: quarry
Time interval: Late Oligocene
Zone: Whitneyan
Ma: 32.65
Age basis: AEO
Geography comments: a point locality "in the NW 1/4, Sec. 24, T39N R89W"
thought to be "late Oligocene (Whitneyan)", with disagreement in the literature and the latest assignment of Emry et al. (1987) agreeing with Setoguchi
formation assignment is unclear
a vitric tuff dated by K-Ar at 34.3 ± 1.4 m.y. by Riedel (1969) underlies the fauna, but the date is thought to be "in error" and "too old" based on biochronology
thought to be "late Oligocene (Whitneyan)", with disagreement in the literature and the latest assignment of Emry et al. (1987) agreeing with Setoguchi
formation assignment is unclear
a vitric tuff dated by K-Ar at 34.3 ± 1.4 m.y. by Riedel (1969) underlies the fauna, but the date is thought to be "in error" and "too old" based on biochronology
Environment
Lithology: siltstone
Taphonomic context: fluvial deposit
Habitat comments: this part of the section includes "tan tuffaceous siltstones and sandstones" but all the fossils are from "A calcareously cemented lens of siltstone" that is "about 12 m above the vitric tuff"
the fossils "are mostly isolated teeth and jaw fragments" that are mostly "less than 3 mm in diameter", interpreted as "well sorted by stream action" within a "channel-fill" in a general "braided stream situation"
the fossils "are mostly isolated teeth and jaw fragments" that are mostly "less than 3 mm in diameter", interpreted as "well sorted by stream action" within a "channel-fill" in a general "braided stream situation"
Methods
Life forms: carnivores,rodents,ungulates,other small mammals,lizards,salamanders
Sampling methods: screenwash
Sample size: specimens
Years: 1964 - 1966
Museum: Carnegie Museum of Natural History, University of Kansas
Sampling comments: discovered in 1964 by a CMNH field party and "prospected in 1965... some two tons of matrix were washed from locality 19 in 1966" and although "prospecting was continued by field parties from the University of Kansas in 1971 and Texas Tech University in 1973 and 1974"; the Texas Tech specimens are not listed
Metadata
Sample number: 4630
Contributor: John Alroy
Enterer: John Alroy
Modifier no: John Alroy
Created: 2025-01-02 21:35:49
Modified: 2025-01-03 00:38:50
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