Rabbit Graveyard (Green Marker Level)
Basic information
Sample name: Rabbit Graveyard (Green Marker Level)
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: 42.87° N, -103.01° W
Coordinate basis: estimated from map
Scale: outcrop
Formation: Chadron
Time interval: Early Oligocene
Zone: Brule
Section: Chadron
Unit number: 3
Unit order: below to above
Max Ma: 33.726
Min Ma: 33.214
Age basis: paleomag
Geography comments: coordinate based on the map in Fig. 1
from five localities in the area's sections 3 and 4 (see Fig. 1)
from a stratigraphic interval in the Orella Member in the middle 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
the Green Marker Bed "occurs 40 to 50 ft (12.1-15.2 m) above the PWL"
from five localities in the area's sections 3 and 4 (see Fig. 1)
from a stratigraphic interval in the Orella Member in the middle 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
the Green Marker Bed "occurs 40 to 50 ft (12.1-15.2 m) above the PWL"
Environment
Lithology: siltstone
Taphonomic context: paleosol
Habitat comments: "a standard Gleska Series paleosol profile; a strongly green clayey siltstone "A" horizon underlain by a pink clayey siltstone "B" horizon"
Methods
Life forms: carnivores,rodents,ungulates,other small mammals
Sample size: 143 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
previous collections not enumerated here were made by the University of Nebraska State Museum and the AMNH
Metadata
Sample number: 4592
Contributor: John Alroy
Enterer: John Alroy
Created: 2024-12-09 11:53:13
Modified: 2024-12-09 11:53:13
Abundance distribution
20 species
7 singletons
total count 143
geometric series index: 39.8
Fisher's α: 6.326
geometric series k: 0.7979
Hurlbert's PIE: 0.7157
Shannon's H: 1.9801
Good's u: 0.9511
Each square represents a species. Square sizes are proportional to counts.
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Register
| Didelphidae indet. | 8 | |
| "Peratherium sp." | ||
| †Ischyromys typus | 6 | |
| †Agnotocastor readingi | 1 | |
| Korth (1988): type; "Agnotocastor praetereadens" from CSC-80 | ||
| †Eutypomys thomsoni | 1 | |
| †Paradjidaumo trilophus | 1 | |
| †Adjidaumo minutus | 8 | |
| †Heliscomys hatcheri | 1 | |
| †Eumys elegans | 1 | |
| †Palaeolagus haydeni | 73 | |
| †Megalagus turgidus | 4 | |
| †Hyaenodon crucians | 1 | |
| †Hesperocyon gregarius | 3 | |
| †Mesohippus bairdi | 4 | |
| †Hyracodon nebraskensis | 4 | |
| Rhinocerotidae indet. | 3 | |
| "larger rhino" | ||
| Merycoidodon sp. | 3 | |
| †Poebrotherium wilsoni | 5 | |
| †Hypertragulus calcaratus | 2 | |
| †Leptomeryx evansi | 13 | |
| Leptomeryx sp. | 1 | |
| "large" | ||