Dead Horse
Basic information
Sample name: Dead Horse
Reference: E. P. Gustafson. 1986. Preliminary biostratigraphy of the White River Group (Oligocene, Chadron and Brule formations) in the vicinity of Chadron, Nebraska. Transactions of the Nebraska Academy of Sciences 14:7-19 [ER 4137]
Geography
Country: United States
State: Nebraska
County: Dawes
Coordinate: 42.83° N, -103.07° W
Coordinate basis: estimated from map
Scale: local area
Formation: Chadron
Time interval: Early Oligocene
Zone: Brule
Section: Chadron
Unit number: 2
Unit order: below to above
Max Ma: 33.726
Min Ma: 33.214
Age basis: paleomag
Geography comments: coordinate based on a point west of the town of Chadron (see Fig. 1)
apparently, from seven localities in the area's sections 2, 3, and 4 (see Fig. 1)
from a stratigraphic interval in the Orella Member near the base of chron C13n (age assignment based on the boundaries of C13n according to Ogg 2020)
the text misidentifies the normal zone in Fig. 3 as chron C11n instead of C13n
"Most of the fossils occur within the 30 ft (9.2 m) of sediment immediately above the PWL, and most lie below a thin Blue Ash which Skinner has used as a marker"
apparently, from seven localities in the area's sections 2, 3, and 4 (see Fig. 1)
from a stratigraphic interval in the Orella Member near the base of chron C13n (age assignment based on the boundaries of C13n according to Ogg 2020)
the text misidentifies the normal zone in Fig. 3 as chron C11n instead of C13n
"Most of the fossils occur within the 30 ft (9.2 m) of sediment immediately above the PWL, and most lie below a thin Blue Ash which Skinner has used as a marker"
Environment
Lithology: siltstone
Habitat comments: "a series of very highly fossiliferous pink and green siltstones with pink predominating, characterized by the exceptionally high abundance of large tortoises and oreodonts and known in field notes as the Turtle Level. Skulls of mammals at this level commonly are associated with partial postcranial skeleton"
Methods
Life forms: carnivores,rodents,ungulates,other small mammals
Sample size: 305 specimens
Museum: Chadron State College
Sampling comments: "This paper is the result of three years of field work" (years not stated)
previous collections not enumerated here were made by the University of Nebraska State Museum and the AMNH
"The fossil fauna is dominated by tortoises and oreodonts"
previous collections not enumerated here were made by the University of Nebraska State Museum and the AMNH
"The fossil fauna is dominated by tortoises and oreodonts"
Metadata
Sample number: 4591
Contributor: John Alroy
Enterer: John Alroy
Created: 2024-12-09 11:30:37
Modified: 2024-12-09 11:30:37
Abundance distribution
21 species
4 singletons
total count 305
geometric series index: 33.0
Fisher's α: 5.116
geometric series k: 0.8037
Hurlbert's PIE: 0.8509
Shannon's H: 2.2351
Good's u: 0.9869
Each square represents a species. Square sizes are proportional to counts.
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Register
| Leptictis sp. | 1 | |
| Ischyromys parvidens = Ischyromys sp. | 8 | |
| †Paradjidaumo trilophus | 1 | |
| †Palaeolagus haydeni | 36 | |
| †Megalagus turgidus | 2 | |
| †Hyaenodon crucians | 1 | |
| †Hesperocyon gregarius | 4 | |
| †Hoplophoneus primaevus | 2 | |
| †Dinictis felina | 2 | |
| †Mesohippus bairdi | 18 | |
| †Hyracodon nebraskensis | 5 | |
| Rhinocerotidae indet. | 3 | |
| "larger rhino" | ||
| Stibarus lemurinus = †Stibarus obtusilobus | 1 | |
| †Archaeotherium mortoni | 3 | |
| †Merycoidodon culbertsoni | 79 | |
| †Miniochoerus gracilis | 54 | |
| †Poebrotherium wilsoni | 23 | |
| †Hypisodus minimus | 3 | |
| †Hypertragulus calcaratus | 7 | |
| †Leptomeryx evansi | 48 | |
| Leptomeryx sp. | 4 | |
| "large" | ||