Observation Quarry
Basic information
Sample name: Observation Quarry

Reference: W. W. Korth and R. L. Evander. 2016. Lipotyphla, Chiroptera, Lagomorpha, and Rodentia (Mammalia) from Observation Quarry, earliest Barstovian (Miocene), Dawes County, Nebraska. Annals of Carnegie Museum 83(3):219-254 [ER 4187]
Geography
Country: United States

State: Nebraska

County: Dawes

Coordinate: 42.66° N, -102.8° W
Latlng basis: stated in text

Scale: quarry

Time interval: Middle Miocene

Zone: Barstovian

Ma: 17.1

Age basis: AEO

Geography comments: "at the crest of an isolated hillock near the center of Section 14, T. 31 N., R. 47 W... approximately 12.5 kilometers west of Hay Springs"
the formation is unidentified because exposures are limited in the area
said to be earliest Barstovian
AEO estimate is based primarily on large mammals

•
Environment
Lithology: not described

Habitat comments: "The local lithostratigraphic setting at Observation Quarry is essentially unknowable" because the site is "so disturbed by quarry activity" and further "excavation is not possible"

Methods
Life forms: bats, rodents, other small mammals

Excluded forms: carnivores, ungulates

Sampling methods: quarry, screenwash

Sample size: 675 specimens

Museum: AMNH; University of Nebraska State Museum

Net or trap nights: 0

Basal area status: not applicable

Sampling comments: the quarry has been collected "since the 1930s" and "Screening for micromammals was undertaken at the quarry from the 1940s to the 1970s by Ted Galusha of the American Museum of Natural History" but many of the specimens are in the UNSM

Metadata
Sample no: 4652

Contributor no: John Alroy

Enterer: John Alroy

Modifier no: John Alroy

Created: 2025-01-10 08:47:40

Modified: 2025-01-10 09:07:41

Abundance distribution
Each square represents a species. Square sizes are proportional to counts. Values are logged.
Statistics
21 species
2 singletons
total count 675
geometric series index: 26.7
Fisher's α: 4.112
geometric series k: 0.755
Hurlbert's PIE: 0.7902
Shannon's H: 2.1059
Good's u: 0.997
Register
†Plesiosorex greeni 75
"Meterix sp." of Rich (1981)
†Lanthanotherium observatum 69
type: "Lanthanotherium sp." of Rich (1981)
†Metechinus amplior 10
†Pseudotrimylus roperi 19
†Antesorex wilsoni 6
type
Alluvisorex sp. 1
†Scalopoides hutchisoni 7
type
Myotis sp. 1
?
†Oreolagus nebrascensis 25
†Hypolagus parviplicatus 76
†Pronotolagus cf. albus 5
†Alphagaulus vetus 29
7 UNSM specimens plus 22 F:AM specimens described by Korth (2000)
†Galbreathia bettae 18
specimen count from Korth (1999)
†Umbogaulus galushai 18
specimen count from Korth (2000)
†Miospermophilus bryanti 16
†Monosaulax tedi 276
76 UNSM specimens plus "over 200" AMNH specimens described by Korth (1999)
†Leptodontomys stirtoni 2
Mookomys altifluminis 2
†Mioheteromys subterior 7
type
†Jimomys labaughi 9
8 specimens described by Wahlert (1976) plus one new one
†Copemys lindsayi 4