North Fork of Owl Creek (UW V-79004)
Basic information
Sample name: North Fork of Owl Creek (UW V-79004)
Reference: J. G. Eaton. 1985. Paleontology and correlation of the Eocene Tepee Trail and Wiggins Formations in the North Fork of Owl Creek area, southeastern Absaroka Range, Hot Springs County, Wyoming. Journal of Vertebrate Paleontology 5(4):345-370 [ER 4126]
Geography
Country: United States
State: Wyoming
County: Hot Springs
Coordinate: 43.78° N, -109.11° W
Coordinate basis: estimated from map
Formation: Wiggins
Time interval: Middle Eocene
Zone: Uintan
Section: Owl Creek
Unit number: 2
Unit order: below to above
Max Ma: 46.235
Min Ma: 43.45
Age basis: paleomag
Geography comments: from the upper Wiggins Formation near the top of the section and thought be equivalent to Uinta B
within a reversed zone in the upper part of "the Anomaly 21 Chron" (chron 21r)
there is a K-Ar date near the base of the Wiggins Formation of 46.0 ± 1.7 Ma
this date is just within error of the upper bound of c21r, but 46.0 Ma is within the long chron 20r based on the boundary values of Ogg (2020) (basis of age assignment)
c20r spans much of the Lutetian and is early Middle Eocene
based on stratigraphically close date of 46.0 ± 1.7 Ma for the immediately overlying lower Wiggins Formation, I believe that the overlying reversed zone is actually chron c20r and that the K-Ar date is erroneous, which is consistent with an age of c21n for the fauna (basis of age assignment)
c21n is early Lutetian and early Middle Eocene
within a reversed zone in the upper part of "the Anomaly 21 Chron" (chron 21r)
there is a K-Ar date near the base of the Wiggins Formation of 46.0 ± 1.7 Ma
this date is just within error of the upper bound of c21r, but 46.0 Ma is within the long chron 20r based on the boundary values of Ogg (2020) (basis of age assignment)
c20r spans much of the Lutetian and is early Middle Eocene
based on stratigraphically close date of 46.0 ± 1.7 Ma for the immediately overlying lower Wiggins Formation, I believe that the overlying reversed zone is actually chron c20r and that the K-Ar date is erroneous, which is consistent with an age of c21n for the fauna (basis of age assignment)
c21n is early Lutetian and early Middle Eocene
Environment
Lithology: not described
Habitat comments: the formation has "light color" and is of "conglomeratic-highly tuffaceous nature" but the site's lithology is not discussed
Methods
Life forms: carnivores,primates,rodents,ungulates,other small mammals
Sample size: 47 specimens
Museum: University of Wyoming
Sampling comments: collecting methods are not detailed
Metadata
Sample number: 4570
Contributor: John Alroy
Enterer: John Alroy
Created: 2024-12-07 04:43:46
Modified: 2024-12-07 04:43:46
Abundance distribution
15 species
8 singletons
total count 47
geometric series index: 45.4
Fisher's α: 7.612
geometric series k: 0.8135
Hurlbert's PIE: 0.8080
Shannon's H: 2.1537
Good's u: 0.8316
Each square represents a species. Square sizes are proportional to counts.
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Register
| Ocajila sp. | 1 | |
| cf. | ||
| †Macrotarsius cf. siegerti | 1 | |
| Hemiacodon sp. | 1 | |
| cf. | ||
| †Microsyops cf. annectens | 1 | |
| †Paramys cf. copei | 5 | |
| †Reithroparamys cf. delicatissimus | 2 | |
| Procynodictis sp. | 2 | |
| cf. | ||
| †Hyopsodus uintensis | 18 | |
| Epihippus uintensis = †Duchesnehippus intermedius | 5 | |
| †Colodon cf. woodi | 4 | |
| Dilophodon sp. | 1 | |
| Amynodon sp. | 1 | |
| Auxontodon sp. | 3 | |
| cf. | ||
| Dichobunidae indet. | 1 | |
| "small dichobunid artiodactyl" | ||
| †Protoreodon cf. pumilus | 1 | |