PTRM-V92067
Basic information
Sample name: PTRM-V92067
Reference: J. P. Hunter and D. A. Pearson. 1996. First record of Lancian (Late Cretaceous) mammals from the Hell Creek Formation of southwestern North Dakota, USA. Cretaceous Research 17(5):633-643 [ER 4120]
Geography
Country: United States
State: North Dakota
County: Bowman
Coordinate: 46.13° N, -103.81° W
Coordinate basis: stated in text
Scale: outcrop
Formation: Hell Creek
Time interval: Maastrichtian
Zone: Lancian
Geography comments: "in the Little Missouri badlands on public (county) land in the NE 1/4, NW 1/4, SE 1/4, SW 1/4 section 27, T131N, R105W. The site consists of three low, sandy knobs in a valley floor approximately 2910 feet (1018.5m) above sea-level"
"near the middle of the 110-m thick... approximately 35 m below the contact with the overlying Ludlow Formation. The K/T boundary occurs approximately 1 m above the Hell Creek–Ludlow contact"
the site is "within megafloral biozone HC IIb... HC II and III floral biozones coincide with Sphenodiscus (Coahuilites) and younger biozones of the Western Interior ammonite zonation"
"near the middle of the 110-m thick... approximately 35 m below the contact with the overlying Ludlow Formation. The K/T boundary occurs approximately 1 m above the Hell Creek–Ludlow contact"
the site is "within megafloral biozone HC IIb... HC II and III floral biozones coincide with Sphenodiscus (Coahuilites) and younger biozones of the Western Interior ammonite zonation"
Environment
Lithology: sandstone
Habitat comments: "Trenching into one of the knobs revealed that vertebrate fossils occur in three thin (<1 m) sandstone lenses intercalated with mudstones of comparable thickness (Figure 1A). Most material, however, was collected from a sandy wash at the surface and thus could not be associated with a particular horizon."
Methods
Life forms: other small mammals
Sampling methods: quarry,surface
Sample size: 34 specimens
Years: 1995
Museum: Pioneer Trails Regional Museum
Sampling comments: "More than 2500 specimens of fossil vertebrates have been collected at PTRM-V92067 of which about 2200 have been identified at least to the ordinal level" and percentages of lizards, birds, snakes, fish, dinosaurs, turtles, "amphibians", crocodilians, and champsosaurs are illustrated
apparently collected by a crew led by Hunter in 1995
apparently collected by a crew led by Hunter in 1995
Metadata
Sample number: 4557
Contributor: John Alroy
Enterer: John Alroy
Created: 2024-12-04 10:13:41
Modified: 2024-12-04 10:13:41
Abundance distribution
5 species
3 singletons
total count 34
geometric series index: 13.9
Fisher's α: 1.617
geometric series k: 0.4472
Hurlbert's PIE: 0.4082
Shannon's H: 0.8433
Good's u: 0.9118
Each square represents a species. Square sizes are proportional to counts.
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Register
| Mesodma sp. | 1 | |
| †Meniscoessus robustus | 25 | |
| "species group sensu Flynn (1986)" | ||
| †Didelphodon vorax | 6 | |
| Pediomys cf. florencae = †Protolambda cf. florencae | 1 | |
| †Gypsonictops illuminatus | 1 | |