Warren (RV-7702)
Basic information
Sample name: Warren (RV-7702)

Reference: S. R. May, M. O. Woodburne, E. H. Lindsay, L. B. Albright, A. Sarna-Wojcicki, E. Wan, and D. B. Wahl. 2011. Geology and mammalian paleontology of the Horned Toad Hills, Mojave Desert, California, USA. Palaeontologia Electronica 14(3.28A):1-63 [ER 4188]
Geography
Country: United States

State: California

County: Kern

Coordinate: 35.1° N, -118.43° W
Latlng basis: estimated from map

Formation: Horned Toad

Time interval: Early Pliocene

Zone: Hemphillian

Max Ma: 4.997

Min Ma: 4.83

Age basis: other

Geography comments: sections in Fig. 5 are centered roughly in the NE 1/4 of sec. 35, T32S, R15W (not R12W as shown in the figure, which is erroneous)
from Member Two of the Horned Toad Formation
underlies the Lawlor Tuff, which has been 40Ar/39Ar "dated elsewhere at 4.83 ± 0.04 Ma"
"most of Member Two is interpreted as Chron 3n.3r" (base is 4.997 Ma according to Ogg 2020)

•
Environment
Lithology: siltstone

Habitat comments: the member includes "interbedded sandstones and mudstones... interpreted as fluvial to lacustrine depositional facies" and RV-7702 was yielded by "sandy siltstone" (Fig. 15)

Methods
Life forms: carnivores, rodents, ungulates, other small mammals

Sampling methods: screenwash

Sample size: 136 specimens

Museum: UCMP

Net or trap nights: 0

Basal area status: not applicable

Sampling comments: "W. Daily and colleagues from the University of California, Riverside collected, washed, and sorted a large volume of fossiliferous sediment" from this site

Metadata
Sample no: 4653

Contributor no: John Alroy

Enterer: John Alroy

Modifier no: John Alroy

Created: 2025-01-12 06:19:16

Modified: 2025-01-12 06:34:53

Abundance distribution
Each square represents a species. Square sizes are proportional to counts. Values are logged.
Statistics
18 species
3 singletons
total count 136
geometric series index: 29.1
Fisher's α: 5.561
geometric series k: 0.8004
Hurlbert's PIE: 0.8442
Shannon's H: 2.2891
Good's u: 0.9784
Register
Cryptotis sp. 7
Scapanus sp. 3
cf.
†Hypolagus vetus 2
†Hypolagus edensis 10
Spermophilus sp. 6
?
†Prothomomys warrenensis 16
type
Perognathinae indet.3
"? Perognathus sp."
†Repomys gustelyi 44
type of May 1981, who provides the count
†Postcopemys valensis 3
Peromyscus sp. A 4
Peromyscus sp. B 1
†Jacobsomys dailyi 15
type
†Machairodus cf. coloradensis (saber-toothed cat)2
†Dinohippus edensis (horse)14
†Teleoceras cf. fossiger (rhinoceros)1
compared with the type from Long Island Quarry
†Megatylopus cf. matthewi 1
†Hemiauchenia vera (camel)2
Camelidae indet.2
additional taxon