Muddy Tork
Basic information
Sample name: Muddy Tork

Sample aka: L6205; Makoshika State Park

Reference: J. P. Hunter, J. H. Hartman, and D. W. Krause. 1997. Mammals and mollusks across the Cretaceous-Tertiary boundary from Makoshika State Park and vicinity (Williston Basin), Montana. Contributions to Geology, University of Wyoming 32(1):61-114 [ER 4119]
Geography
Country: United States

State: Montana


County: Dawson


Coordinate: 47.09° N, -104.72° W
Coordinate basis: stated in text

Formation: Hell Creek

Time interval: Maastrichtian

Zone: Lancian

Max Ma: 68.178

Min Ma: 66.38

Age basis: paleomag

Geography comments: "in sec. 2, T. 15 N., R. 55 E., on land owned by Dawson County Community College, just outside Makoshika State Park"
"about 11 m below the K/T boundary" and in Chron 30n based on local paleomagnetic data (age assignment based on Ogg 2020)

Environment
Lithology: sandstone

Taphonomic context: fluvial deposit

Habitat comments: "in the basal part of a sandstone forming a feature known as the Witches Hat"

Methods
Life forms: other small mammals

Sampling methods: screenwash

Sample size: 28 specimens

Years: 1992

Museum: Museum of the Rockies

Sampling comments: "discovered by Dr. Robert Hiatt... rediscovered in 1992, at which time mammalian fossils were found. A few snail steinkerns have also been recovered"
"approximately 1000 kg of matrix was removed for screen washing"

Metadata
Sample number: 4550

Contributor: John Alroy

Enterer: John Alroy

Modifier no: John Alroy

Created: 2024-12-04 08:36:49

Modified: 2024-12-04 08:43:39

Abundance distribution
10 species
6 singletons
total count 28
geometric series index: 38.5
Fisher's α: 5.565
geometric series k: 0.7402
Hurlbert's PIE: 0.6720
Shannon's H: 1.6647
Good's u: 0.7909
Each square represents a species. Square sizes are proportional to counts.
Register
Mesodma cf. thompsoni3
Mesodma sp.1
Meniscoessus robustus15
Turgidodon rhaister1
Pediomys cf. krejcii = †Leptalestes cf. krejcii1
Pediomyidae indet.1
"Pediomys elegans or P. cooki" (now in separate genera)
Pediomys hatcheri = †Protolambda hatcheri1
Pediomys florencae = †Protolambda florencae2
Didelphodon vorax2
Didelphodon sp.1
?