Hiatt South
Basic information
Sample name: Hiatt South
Sample aka: L6424; 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, -104.70° W
Coordinate basis: stated in text
Formation: Fort Union
Time interval: Early Palaeocene
Zone: Puercan
Max Ma: 66
Min Ma: 65.7
Age basis: paleomag
Geography comments: "in sec. 1., T. 15 N., R. 55 E., in Makoshika State Park"
from the lower Ludlow Member of the Fort Union Formation and "stratigraphically equivalent to the Hiatt Locality"
"near the end of the time represented by Chron 29r" based on local paleomagnetic data and "middle Puercan (Pu2?)" (maximum age based on the ICS 2023 date for the K-Pg boundary minimum age based on Ogg 2020)
from the lower Ludlow Member of the Fort Union Formation and "stratigraphically equivalent to the Hiatt Locality"
"near the end of the time represented by Chron 29r" based on local paleomagnetic data and "middle Puercan (Pu2?)" (maximum age based on the ICS 2023 date for the K-Pg boundary minimum age based on Ogg 2020)
Environment
Lithology: sandstone
Taphonomic context: fluvial deposit
Habitat comments: "in the lowermost part of the intraclastic conglomeratic facies of a sequence of stacked channel sandstones"
Methods
Life forms: ungulates,other large mammals,other small mammals
Sampling methods: screenwash
Sample size: 33 specimens
Years: 1993 - 1995
Museum: Museum of the Rockies
Sampling comments: "discovered in 1993" by a "SUNY crew" led by Hunter
"In 1994, approximately 2200 kg of matrix was removed... and screen-washed"
"significant collecting efforts in 1994 and 1995 were centered here. A few poor-quality freshwater mollusks also have been found at this locality" (meaning snails, because clams are otherwise only present at the Deer Crash locality)
"In 1994, approximately 2200 kg of matrix was removed... and screen-washed"
"significant collecting efforts in 1994 and 1995 were centered here. A few poor-quality freshwater mollusks also have been found at this locality" (meaning snails, because clams are otherwise only present at the Deer Crash locality)
Metadata
Sample number: 4554
Contributor: John Alroy
Enterer: John Alroy
Modifier no: John Alroy
Created: 2024-12-04 09:43:46
Modified: 2024-12-04 09:45:01
Abundance distribution
11 species
6 singletons
total count 33
geometric series index: 34.0
Fisher's α: 5.778
geometric series k: 0.7680
Hurlbert's PIE: 0.7642
Shannon's H: 1.8913
Good's u: 0.8201
Each square represents a species. Square sizes are proportional to counts.
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Register
| Stygimys sp. | 1 | |
| Baioconodon cf. nordicum = †Baioconodon cf. nordicus | 14 | |
| †Loxolophus schizophrenus | 1 | |
| Loxolophus sp. | 3 | |
| ? | ||
| Oxyclaenus sp. | 3 | |
| ? | ||
| Carcinodon sp. | 1 | |
| ? | ||
| †Eoconodon ? nidhoggi | 1 | |
| †Oxyacodon ferronensis | 1 | |
| †Oxyacodon apiculatus | 2 | |
| †Tinuviel eurydice | 5 | |
| †Onychodectes tisonensis | 1 | |