Coke's Clemmys
Basic information
Sample name: Coke's Clemmys
Sample aka: UCMP V88046; UWBM C1908; CC
Reference: S. M. Smith, C. J. Sprain, W. A. Clemens, D. L. Lofgren, P. R. Renne, and G. P. Wilson. 2018. Early mammalian recovery after the end-Cretaceous mass extinction: A high-resolution view from McGuire Creek area, Montana, USA. Geological Society of America Bulletin 130(11/12):2000-2014 [ER 4122]
Geography
Country: United States
State: Montana
County: McCone
Coordinate: 47.74° N, -106.22° W
Coordinate basis: estimated from map
Formation: Hell Creek
Time interval: Early Palaeocene
Zone: Puercan
Section: McGuire Creek
Unit number: 2
Unit order: below to above
Ma: 65.802
Age basis: Ar-Ar
Geography comments: coordinate estimated from the map in Fig. 1
"~10.3 m above the top of the MCZ coal and is directly on top of the 2330 coal... the C29r/C29n reversal, dated at 65.724 ± 0.013/0.044 Ma, occurs right around the 2380 coal and significantly above" Luck O Hutch, which is higher in the section than Coke's Clemmys
the MCZ coal is Ar-Ar dated in the study at 66.024 ± 0.014/0.044 Ma
the 2330 coal "contains one tephra (bentonite) layer that was sampled for 40Ar/39Ar analysis" and "yielded a weighted mean age of 65.802 ± 0.116/0.125"
"~10.3 m above the top of the MCZ coal and is directly on top of the 2330 coal... the C29r/C29n reversal, dated at 65.724 ± 0.013/0.044 Ma, occurs right around the 2380 coal and significantly above" Luck O Hutch, which is higher in the section than Coke's Clemmys
the MCZ coal is Ar-Ar dated in the study at 66.024 ± 0.014/0.044 Ma
the 2330 coal "contains one tephra (bentonite) layer that was sampled for 40Ar/39Ar analysis" and "yielded a weighted mean age of 65.802 ± 0.116/0.125"
Environment
Lithology: sandstone
Taphonomic context: fluvial deposit
Habitat comments: "CC is within a ~6.5-m-thick channel deposit that mostly consists of siltstone. The fossil-bearing horizon falls within a cross-bedded sandstone at the base of the channel deposit. The channel locally cuts down into the 2330 coal"
the material is "isolated teeth and fragmentary jaws"
the material is "isolated teeth and fragmentary jaws"
Methods
Life forms: primates,ungulates,other small mammals
Sampling methods: screenwash
Sample size: 58 specimens
Years: 2014 - 2016
Museum: UCMP, RAM, UWBM
Sampling comments: the McGuire Creek localities were all revisited by UWBM crews led by Smith and Wilson in 2014, 2015, and 2016 after having been collected by UCMP and Raymond M. Alf Museum of Paleontology (RAM) crews led by Lofgren "in the 1980s and early 1990s"
fossils were obtained by "surface collection and underwater screenwashing"
fossils were obtained by "surface collection and underwater screenwashing"
Metadata
Sample number: 4562
Contributor: John Alroy
Enterer: John Alroy
Modifier no: John Alroy
Created: 2024-12-05 10:16:02
Modified: 2024-12-05 10:19:02
Abundance distribution
12 species
3 singletons
total count 58
geometric series index: 22.2
Fisher's α: 4.595
geometric series k: 0.7818
Hurlbert's PIE: 0.8318
Shannon's H: 2.0682
Good's u: 0.9495
Each square represents a species. Square sizes are proportional to counts.
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