Lane's Little Jaw Site
Basic information
Sample name: Lane's Little Jaw Site
Sample aka: LLJS; LACM 7942; McGill Ranc
Reference: T. S. Kelly. 2014. Preliminary report on the mammals from Lane's Little Jaw Site Quarry: a latest Cretaceous (earliest Puercan?) local fauna, Hell Creek Formation, southeastern Montana. Paludicola 10(1):50-91 [ER 4113]
Geography
Country: United States
State: Montana
County: Powder River
Coordinate: 45.67° N, -105.07° W
Coordinate basis: stated in text
Scale: quarry
Formation: Hell Creek
Time interval: Maastrichtian
Zone: Lancian
Geography comments: "near the southeastern end of Sixmile Ridge" and shown in the map in Fig. 1 to be in section 2, T 2 S, R 54 E
the site "occurs in the upper Hell Creek Formation" well below the contact with the Tullock Member, and is considered to be latest Cretaceous and possibly earliest Puercan, but Lancian because the K-Pg boundary is clearly above the site and the Lancian-Puercan boundary is normally equated with the K-Pg boundary
the site "occurs in the upper Hell Creek Formation" well below the contact with the Tullock Member, and is considered to be latest Cretaceous and possibly earliest Puercan, but Lancian because the K-Pg boundary is clearly above the site and the Lancian-Puercan boundary is normally equated with the K-Pg boundary
Environment
Lithology: sandstone
Taphonomic context: fluvial deposit
Habitat comments: "at the base of a filled channel cut... The fossiliferous horizon at the quarry occurs in a distinctive layer along the base of the channel cut. This layer is characterized by yellowish-buff, fine-grained sandstone matrix with numerous rounded claystone clasts and occasional pebble clasts"
Methods
Life forms: ungulates,other small mammals
Sample size: 60 specimens
Museum: LACM
Sampling comments: named after "the landowner's son, Lane McGill, because he found the first small mammal jaw at the site. Subsequently, Kurtis W. Hooley, a local collector, and Lewis McGill opened a commercial quarry at the site... Hooley and McGill graciously donated the specimens described in this study" but whether they used screenwashing is not discussed
"Chrondrichthyes, Actinoptergyii, Allocaudata, Testudines, Crocodylia, Choristodera, and non-avian dinosaurs" are also present and listed in detail, but not enumerated
"Chrondrichthyes, Actinoptergyii, Allocaudata, Testudines, Crocodylia, Choristodera, and non-avian dinosaurs" are also present and listed in detail, but not enumerated
Metadata
Sample number: 4544
Contributor: John Alroy
Enterer: John Alroy
Modifier no: John Alroy
Created: 2024-12-03 06:16:29
Modified: 2024-12-03 12:15:18
Abundance distribution
16 species
6 singletons
total count 60
geometric series index: 35.9
Fisher's α: 7.139
geometric series k: 0.8473
Hurlbert's PIE: 0.8842
Shannon's H: 2.4016
Good's u: 0.9022
Each square represents a species. Square sizes are proportional to counts.
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Register
| †Meniscoessus robustus | 8 | |
| Mesodma sp. | 6 | |
| possibly two species | ||
| Cimolodon sp. | 8 | |
| ? | ||
| †Turgidodon rhaister | 1 | |
| †Glasbius twitchelli | 1 | |
| †Protolambda mcgilli | 2 | |
| type | ||
| †Pediomys elegans | 1 | |
| †Leptalestes ? cooki | 1 | |
| Leptalestes sp. | 2 | |
| ? | ||
| †Didelphodon vorax | 4 | |
| Eodelphis sp. | 2 | |
| cf. | ||
| Procerberus sp. large | 2 | |
| Procerberus sp. small | 1 | |
| ? | ||
| Cimolestes sp. | 1 | |
| †Baioconodon cf. nordicus | 8 | |
| †Paleoungulatum hooleyi | 12 | |
| type | ||