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, -102.80° W
Coordinate 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
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
Sampling methods: quarry,screenwash
Sample size: 675 specimens
Museum: AMNH; University of Nebraska State Museum
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 number: 4652
Contributor: 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
21 species
2 singletons
total count 675
geometric series index: 26.7
Fisher's α: 4.112
geometric series k: 0.7550
Hurlbert's PIE: 0.7902
Shannon's H: 2.1059
Good's u: 0.9970
Each square represents a species. Square sizes are proportional to counts.
• Find matching samples
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 altifluminus | 2 | |
| †Mioheteromys subterior | 7 | |
| type | ||
| †Jimomys labaughi | 9 | |
| 8 specimens described by Wahlert (1976) plus one new one | ||
| †Copemys lindsayi | 4 | |