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)
"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"
"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.
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Register
†Mesodma cf. thompsoni | 3 | |
Mesodma sp. | 1 | |
†Meniscoessus robustus | 15 | |
†Turgidodon rhaister | 1 | |
Pediomys cf. krejcii = †Leptalestes cf. krejcii | 1 | |
Pediomyidae indet. | 1 | |
"Pediomys elegans or P. cooki" (now in separate genera) | ||
Pediomys hatcheri = †Protolambda hatcheri | 1 | |
Pediomys florencae = †Protolambda florencae | 2 | |
†Didelphodon vorax | 2 | |
Didelphodon sp. | 1 | |
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