Sand Wash (Locality 3)
Basic information
Sample name: Sand Wash (Locality 3)

Reference: R. M. West and M. R. Dawson. 1975. Eocene fossil Mammalia from the Sand Wash Basin, northwestern Moffat County, Colorado. Annals of Carnegie Museum 45(11):231-253 [ER 4153]
Geography
Country: United States

State: Colorado

County: Moffat

Coordinate: 40.67° N, -108.42° W
Latlng basis: estimated from map

Formation: Washakie

Time interval: Middle Eocene

Zone: Uintan

Ma: 47.25

Age basis: AEO

Geography comments: shown in Fig. 2 to be in the northwest quarter of secn. 9, T 8 N, R 98 W
from somewhere above the Robin's Egg Blue Tuff according to Stucky et al. (1996)
thought to be "on the Bridgerian-Uintan boundary" by West and Dawson and earliest Uintan or Shoshonian by Stucky et al. (1996)
Sutcky et al. (1996) are unable to correlate the zones represented by magnetic polarity data for the Sand Wash Basin with certainty, but in any event, their sections do not include Locality 3

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Environment
Lithology: not described

Habitat comments: in the southeastern part of the basin yielding the fauna, "the sediment seems considerably finer, shows relatively less channelling, and floodplain and lacustrine sediments are predominant"
"deposited in a margial lacustrine-fluvial setting" according to Stucky et al. (1996)

Methods
Life forms: carnivores, primates, rodents, ungulates

Sample size: 100 specimens

Years: 1961, 1963, 1964, 1972

Museum: Carnegie Museum, University of Colorado Museum

Net or trap nights: 0

Basal area status: not applicable

Sampling comments: Dawson opened the locality in 1961; it was revisited by the CM and AMNH in 1963; by the CM in 1964; and by West, Dawson, and M. C. McKenna in 1972
AMNH specimens are not described if there are any, and UCM specimens from this locality are also described
turtles and "small organisms, fish, amphibians and reptiles" are found in the southeastern part of the basin

Metadata
Sample no: 4612

Contributor no: John Alroy

Enterer: John Alroy

Modifier no: John Alroy

Created: 2024-12-14 16:45:21

Modified: 2025-01-06 10:53:57

Abundance distribution
Each square represents a species. Square sizes are proportional to counts. Values are logged.
Statistics
9 species
2 singletons
total count 100
geometric series index: 17.1
Fisher's α: 2.397
geometric series k: 0.5859
Hurlbert's PIE: 0.4564
Shannon's H: 1.0648
Good's u: 0.9808
Register
†Viverravus minutus (viverravid)1
†Notharctus robustior 2
Leptotomus bridgerensis = †Leptotomus parvus 12
Ischyromyidae indet.2
†Hyopsodus markmani 72
Stucky et al. (1996): "Hyopsodus despiciens"
†Orohippus sylvaticus (horse)6
Hyracodontidate indet.2
Stucky et al. (1996): either Hyrachyus eximius or Forstercooperia grandis; "Hyrachyus modestus"
†Triplopus implicatus (hyracodont)1
Stucky et al. (1996): "Hyrachyus sp." small species
Hylomeryx sp. 2
Stucky et al. (1996): "Homacodon cf. vagans"