Scarritt Quarry
Basic information
Sample name: Scarritt Quarry
Sample aka: Crazy Mountains Basin Loc. 56
Reference: G. G. Simpson. 1937. The Fort Union of the Crazy Mountain Field, Montana, and its mammalian faunas. Bulletin of the United States National Museum 169:1-287 [ER 4101]
Geography
Country: United States
State: Montana
County: Sweetgrass
Coordinate: 46.19° N, -109.92° W
Coordinate basis: stated in text
Scale: quarry
Formation: Fort U.nion
Time interval: Middle Palaeocene
Zone: Tiffanian
Section: CMB
Unit number: 4
Unit order: below to above
Ma: 59.9
Age basis: AEO
Geography comments: "SE1/4NW1/4 sec. 13, T. 5. N, R. 14 E., on the eastern slope of the low divide or spur that extends northward from Cayuse Butte"
"about 2,000 feet above the base of the No. 3 beds, hence about 2,150 feet above the Gidley Quarry and about 3,350 feet above the base of the recognised Fortin this area"
the fossils are from just above, within, and below "a bed, varying from a mere film up to about 4 inches in thickness, almost entirely composed of shell fragments"
the No. 3 beds are "very close" to "the Tiffany in age... but may be slightly earlier" (i.e., are Tiffanian: Ti2 according to Krause and Maas 1990)
"about 2,000 feet above the base of the No. 3 beds, hence about 2,150 feet above the Gidley Quarry and about 3,350 feet above the base of the recognised Fortin this area"
the fossils are from just above, within, and below "a bed, varying from a mere film up to about 4 inches in thickness, almost entirely composed of shell fragments"
the No. 3 beds are "very close" to "the Tiffany in age... but may be slightly earlier" (i.e., are Tiffanian: Ti2 according to Krause and Maas 1990)
Environment
Lithology: claystone
Habitat comments: mammal localities in this area in general are "almost entirely on the rarer shale exposures... seldom as much as a hundred yards in diameter and generally much less... Nothing approaching a complete skeleton has ever been found" in the field area and there are hardly any associations
the quarry is in a "clay" in addition to the shell bed
the quarry is in a "clay" in addition to the shell bed
Methods
Life forms: carnivores,primates,ungulates,other small mammals
Sampling methods: quarry
Sample size: 772 specimens
Years: 1935
Museum: AMNH
Sampling comments: the metadata for this sample are based on Simpson (1937) and the faunal list is drawn from Krause and Maas (1990)
"known only from material in the American Museum that has been published separately" but counts are provided only by Simpson
"found by Mr. [Albert C.] Silberling years ago and a few surface fragments collected" and in 1935 "the Third Scarritt Expedition opened a quarry here"
there are "Gar scales (Lepisosteus sp.)"
counts are of upper and lower jaws only: all species are known from at least one
"known only from material in the American Museum that has been published separately" but counts are provided only by Simpson
"found by Mr. [Albert C.] Silberling years ago and a few surface fragments collected" and in 1935 "the Third Scarritt Expedition opened a quarry here"
there are "Gar scales (Lepisosteus sp.)"
counts are of upper and lower jaws only: all species are known from at least one
Metadata
Sample number: 4525
Contributor: John Alroy
Enterer: John Alroy
Modifier no: John Alroy
Created: 2024-11-30 02:45:59
Modified: 2024-11-30 03:38:54
Abundance distribution
24 species
4 singletons
total count 772
geometric series index: 36.5
Fisher's α: 4.699
geometric series k: 0.7804
Hurlbert's PIE: 0.7734
Shannon's H: 1.9082
Good's u: 0.9948
Each square represents a species. Square sizes are proportional to counts.
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Register
| Ptilodus sp. 1 | 1 | |
| Ptilodus sp. 2 | 2 | |
| †Ectypodus cf. powelli | 6 | |
| †Mesodma pygmaea | 1 | |
| †Neoplagiaulax hunteri | 300 | |
| new | ||
| Neoplagiaulax sp. | 2 | |
| said to be new | ||
| †Pararyctes pattersoni | 4 | |
| Palaeosinopa simpsoni = †Paleotomus senior | 2 | |
| new | ||
| †Paleotomus senior | 2 | |
| new | ||
| Propalaeosinopa diluculi = †Bessoecetor septentrionalis | 124 | |
| includes the type of "Bessoecetor thomsoni" | ||
| †Unuchinia asaphes | 6 | |
| new | ||
| †Leptacodon cf. tener | 13 | |
| †Litocherus notissimus | 155 | |
| new | ||
| Nannodectes sp. | 2 | |
| †Plesiadapis anceps | 45 | |
| new | ||
| †Ignacius frugivorus | 7 | |
| †Carpodaptes hazelae | 36 | |
| new | ||
| †Elpidophorus elegans | 41 | |
| includes the type of "Elpidophorus patratus" | ||
| Protictis sp. | 1 | |
| Dissacus sp. | 1 | |
| Claenodon montanensis = †Arctocyon montanensis | 4 | |
| may include "Tetraclaenodon sp." of Simpson 1936 | ||
| †Thryptacodon cf. australis | 8 | |
| †Chriacus cf. pelvidens | 5 | |
| Titanoides sp. | 4 | |