Jack Creek
Basic information
Sample name: Jack Creek
Sample aka: Carter Mountain; UW V-79005
Reference: J. G. Eaton. 1982. Paleontology and correlation of Eocene volcanic rocks in the Carter Mountain area, Park County, southeastern Absaroka Range, Wyoming. University of Wyoming Contributions to Geology 21(2):153-194 [ER 4142]
Geography
Country: United States
State: Wyoming
County: Park
Coordinate: 44.11° N, -109.35° W
Latlng basis: estimated from map
Formation: Wiggins
Time interval: Early Eocene
Zone: Bridgerian
Ma: 48.41
Age basis: Ar-Ar
Geography comments: "on the south side of the Greybull River near Jack Creek" (coordinate based on Jack Creek Campground)
shown in Fig. 18 as within the Blue Point marker just under the base of the Wiggins Formation near the south end of Carter Mountain
the Blue Point marker is not assigned to a formation because it underlies both the Wiggins and the Tepee Trail and overlies both the Wapiti and the Aycross (Fig. 5)
thought to be equivalent to Bridger B or C
there is a "K:Ar date of 47.9 my ± 0.5 my" on the Blue Point marker (p. 190), which is just younger than the top of the Early Eocene
the marker has since been dated at 48.41 ± 0.17, apparently using Ar/Ar dating (Tsukui et al. 2012)
shown in Fig. 18 as within the Blue Point marker just under the base of the Wiggins Formation near the south end of Carter Mountain
the Blue Point marker is not assigned to a formation because it underlies both the Wiggins and the Tepee Trail and overlies both the Wapiti and the Aycross (Fig. 5)
thought to be equivalent to Bridger B or C
there is a "K:Ar date of 47.9 my ± 0.5 my" on the Blue Point marker (p. 190), which is just younger than the top of the Early Eocene
the marker has since been dated at 48.41 ± 0.17, apparently using Ar/Ar dating (Tsukui et al. 2012)
Environment
Lithology: conglomerate
Habitat comments: the Blue Point marker is "a distinctive conglomerate-ash-conglomerate sequence"
Methods
Life forms: carnivores, primates, rodents, ungulates, other small mammals
Sample size: 51 specimens
Years: 1979
Museum: University of Wyoming
Net or trap nights: 0
Basal area status: not applicable
Sampling comments: collecting methods are not discussed
Metadata
Sample no: 4602
Contributor no: John Alroy
Enterer: John Alroy
Modifier no: John Alroy
Created: 2024-12-12 06:52:02
Modified: 2025-01-04 04:18:47
Abundance distribution
Each square represents a species. Square sizes are proportional to counts. Values are logged.
Statistics
14 species
9 singletons
total count 51
geometric series index: 51.0
Fisher's α: 6.369
geometric series k: 0.7761
Hurlbert's PIE: 0.6875
Shannon's H: 1.7912
Good's u: 0.8235
Register
| †Herpetotherium cf. marsupium | 1 | |
| Notharctus sp. | 1 | |
| †Washakius insignis | 1 | |
| Microsyops sp. | 3 | |
| Gunnell (1989): "Microsyops cf. annectens" | ||
| †Paramys excavatus | 1 | |
| Paramys wyomingensis = †Acritoparamys wyomingensis | 1 | |
| †Leptotomus parvus | 1 | |
| Reithroparamys sp. | 1 | |
| †Pseudotomus robustus | 3 | |
| Korth (1985): "Pseudotomus sp." | ||
| †Limnocyon cf. verus | 1 | |
| †Viverravus cf. sicarius (viverravid) | 1 | |
| †Hyopsodus cf. paulus | 27 | |
| †Hyopsodus tonksi | 5 | |
| type: one specimen tentatively referred | ||
| Orohippus sp. | 4 | |