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: 35.10° N, -118.43° W
Coordinate 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)
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
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 number: 4653
Contributor: 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
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
Each square represents a species. Square sizes are proportional to counts.
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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 | 2 | |
| †Dinohippus edensis | 14 | |
| †Teleoceras cf. fossiger | 1 | |
| compared with the type from Long Island Quarry | ||
| †Megatylopus cf. matthewi | 1 | |
| †Hemiauchenia vera | 2 | |
| Camelidae indet. | 2 | |
| additional taxon | ||