Darton's Bluff
Basic information
Sample name: Darton's Bluff
Reference: M. C. McKenna and J. D. Love. 1972. High-level strata containing early Miocene mammals on the Bighorn Mountains, Wyoming. American Museum Novitates 2490:1-31 [ER 3993]
Geography
Country: United States
State: Wyoming
County: Johnson
Coordinate: 44.12° N, -107.12° W
Coordinate basis: stated in text
Time interval: Early Miocene
Ma: 21.9
Age basis: AEO
Geography comments: "near the head of Canyon Creek" in "SW. 1/4, NE. 1/4, sect. 19, T. 48 N., R. 85 W."
"early Miocene (early Arikareean)"
21.5 Ma or Early Miocene according to Alroy (2009)
all fossils are in the section's unit 8
"early Miocene (early Arikareean)"
21.5 Ma or Early Miocene according to Alroy (2009)
all fossils are in the section's unit 8
Environment
Lithology: sandstone
Taphonomic context: fluvial deposit
Habitat comments: "Sandstone, light buff to tan in lower part, becoming light gray in upper; almost completely massive, homogeneous, soft, porous, fine-grained"
presumed fluvial because the section alternates between sandstones and conglomerates
presumed fluvial because the section alternates between sandstones and conglomerates
Methods
Life forms: ungulates,rodents,other small mammals
Sample size: 10 specimens
Years: 1962 - 1970
Sampling comments: collection methods are not stated
Metadata
Sample number: 4410
Contributor: John Alroy
Enterer: John Alroy
Created: 2024-10-26 04:52:39
Modified: 2024-10-26 04:52:39
Abundance distribution
8 species
6 singletons
total count 10
geometric series index: 64.0
Fisher's α: 18.568
geometric series k: 0.9057
Hurlbert's PIE: 0.8444
Shannon's H: 2.0253
Good's u: 0.4414
Each square represents a species. Square sizes are proportional to counts.
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Register
| Proscalops secundus | 1 | |
| Desmatolagus sp. | 1 | |
| Entoptychus sp. | 2 | |
| Ziamys sp. | 2 | |
| "Pleurolicus cf. leptophrys": see Korth 1996 (JVP); assigned to Schizodontomys sp. by McKenna 1980 | ||
| Geomyidae indet. | 1 | |
| "entoptychine geomyid": see also Korth 1992a, Korth 1994c | ||
| Promylagaulinae indet. | 1 | |
| "Promylagaulus riggsi": reassigned to Promylagulus sp. by McKenna 1980 and could be Trilaccogaulus | ||
| Oreodontoides sp. | 1 | |
| questionably referred | ||
| †Miotylopus gibbi | 1 | |