Cañada Chiquita
Basic information
Sample name: Cañada Chiquita

Sample aka: SDSNH locality 6408

Reference: T. S. Kelly. 2011. Small mammals from the Sespe Formation (Arikareean) of Cañada Chiquita, Orange County, California. Paludicola 8(3):128-141 [ER 4167]
Geography
Country: United States

State: California

County: Orange

Coordinate: 33.53° N, -117.61° W
Latlng basis: estimated from map

Scale: quarry

Formation: Sespe

Time interval: Late Oligocene

Geography comments: at "the Santa Margarita Water District's Upper Chiquita Reservoir at Cañada Chiquita in Rancho Santa Margarita" (coordinate estimated using Google Maps)
"Arikareean in age, possibly early to early late Arikareean" based on biochronology, and therefore bracketed by 30.0 to 22.8 Ma based on the time scale of Albright et al. (2008)
this interval is essentially Late Oligocene and not Early Miocene, contra Fig. 7

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Environment
Lithology: claystone

Habitat comments: "from a silty claystone bed near the base of the exposed section"

Methods
Life forms: rodents, ungulates, other small mammals

Sampling methods: screenwash

Sample size: 61 specimens

Museum: San Diego Museum of Natural History

Net or trap nights: 0

kg screened: 2722

Basal area status: not applicable

Sampling comments: recovered "by wet screen sieving of over 2, 722 kg (6000-pounds) of bulk matrix, followed by heavy liquid separation of the fossils from the resulting concentrate... Due to subsequent construction, the locality has been graded away"

Metadata
Sample no: 4627

Contributor no: John Alroy

Enterer: John Alroy

Created: 2025-01-02 03:31:20

Modified: 2025-01-02 03:31:20

Abundance distribution
Each square represents a species. Square sizes are proportional to counts. Values are logged.
Statistics
10 species
4 singletons
total count 61
geometric series index: 21.2
Fisher's α: 3.4
geometric series k: 0.6737
Hurlbert's PIE: 0.6347
Shannon's H: 1.5167
Good's u: 0.9344
Register
Heterosoricinae indet.1
Archaeolagus sp. 3
Nototamias sp. 1
Heliscomys sp. 7
Tenudomys sp. 3
Proharrymys sp. 4
cf.
Proheteromys sp. 35
Kirkomys sp. 5
cf.
†Leidymys nematodon 1
Artiodactyla indet.1