Wolf Ranch
Basic information
Sample name: Wolf Ranch
Sample aka: UALP Loc. 64
Reference: J. A. Harrison. 1978. Mammals of the Wolf Ranch local fauna, Pliocene of the San Pedro Valley, Arizona. Occasional Papers of the Museum of Natural History, University of Kansas 73:1-18 [ER 4161]
Geography
Country: United States
State: Arizona
County: Cochise
Coordinate: 31.56° N, -110.15° W
Coordinate basis: estimated from map
Scale: outcrop
Formation: St. David
Time interval: Late Pliocene
Zone: Blancan
Max Ma: 3.032
Min Ma: 2.595
Age basis: paleomag
Geography comments: "exposed in the Oro Verde arroyo in the southwestern quarter of Cochise County... north of Arizona Highway 90 and west of the San Pedro River" (coordinate based on the map in FIg. 1)
collections were made "at nine sties along the length of the arroyo and a roadcut" for the highway
the map suggests that the area was small and restricted to a continuous outcrop visible on satellite photos
"The Wolf Ranch fauna occurs in normally magnetized sediments difrectliy beneath reversely magnetized sediments interpreted as the Gauss-Matuyama boundary" (i.e., within chron C2An.1n: age limits based on the time scale of Ogg 2020)
said to be "late Blancan"
collections were made "at nine sties along the length of the arroyo and a roadcut" for the highway
the map suggests that the area was small and restricted to a continuous outcrop visible on satellite photos
"The Wolf Ranch fauna occurs in normally magnetized sediments difrectliy beneath reversely magnetized sediments interpreted as the Gauss-Matuyama boundary" (i.e., within chron C2An.1n: age limits based on the time scale of Ogg 2020)
said to be "late Blancan"
Environment
Lithology: siliciclastic (mixed)
Habitat comments: "The 5.1 meters of approximately horizontal sediments... are primarily sandstones with some minor clay and marl units... taxa were collected from two fossiliferous units, a yellowish gray siltstone (Unit IV) and an olive gray clay (Unit V)"
the unit is both "fluviatile and lacustrine"
the unit is both "fluviatile and lacustrine"
Methods
Life forms: bats,rodents,ungulates,other small mammals
Sampling methods: screenwash
Sample size: 405 specimens
Sampled by: 1971
Museum: University of Arizona Laboratory of Paleontology
Sampling comments: "known since the late 1960's; however, intensive study of the rich small mammal fauna did not commence until 1971... The bulk of the fossil material... was recovered by washing some five hundred pounds of sediment"
Metadata
Sample number: 4620
Contributor: John Alroy
Enterer: John Alroy
Created: 2024-12-19 00:06:48
Modified: 2024-12-19 00:06:48
Abundance distribution
22 species
4 singletons
total count 405
geometric series index: 35.8
Fisher's α: 4.990
geometric series k: 0.7712
Hurlbert's PIE: 0.6447
Shannon's H: 1.7218
Good's u: 0.9902
Each square represents a species. Square sizes are proportional to counts.
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Register
| Antrozous pallidus | 1 | 16.5 g insectivore |
| Czaplewski (1993): "Simonycteris stocki" | ||
| †Notolagus cf. lepusculus | 2 | |
| †Nekrolagus progressus | 10 | |
| †Sylvilagus hibbardi | 1 | |
| White (1991): one specimen of Harrison''s "Nekrolagus progressus" | ||
| †Spermophilus bensoni | 5 | |
| Geomys persimilus = †Nerterogeomys persimilis | 14 | |
| †Perognathus pearlettensis | 2 | |
| †Perognathus gidleyi | 7 | |
| †Prodipodomys idahoensis | 37 | |
| Peromyscus sp. | 2 | |
| †Baiomys brachygnathus | 24 | |
| †Baiomys minimus | 1 | |
| †Onychomys bensoni | 8 | |
| †Bensonomys arizonae | 16 | |
| †Sigmodon minor | 234 | |
| see also Mezzabotta (1997) | ||
| †Sigmodon curtisi | 1 | |
| Neotoma sp. | 26 | |
| Coendou stirtoni = Erethizon bathygnathum | 2 | |
| Stegomastodon sp. | 2 | |
| ? | ||
| Nannippus phlegon = †Nannippus peninsulatus | 6 | |
| †Equus simplicidens | 2 | |
| Camelops sp. | 2 | |
| cf. | ||