Myton Pocket (BYU collection)
Basic information
Sample name: Myton Pocket (BYU collection)
Reference: A. H. Hamblin. 1987. Paleogeography and paleoecology of the Myton Pocket, Uinta Basin, Utah (Uinta Formation-Upper Eocene). Brigham Young University Geology Studies 34(1):33-60 [ER 4149]
Geography
Country: United States
State: Utah
County: Uintah
Coordinate: 40.49° N, -111.87° W
Coordinate basis: stated in text
Scale: outcrop
Formation: Uinta
Time interval: Middle Eocene
Zone: Uintan
Section: Uinta
Unit number: 3
Unit order: below to above
Max Ma: 43.45
Min Ma: 42.196
Age basis: paleomag
Geography comments: Hamblin's measured section at Myton Pocket is in the "SE1/4, SE1/4, SW1/4, of Section 6, T. 4 S, R. 1 E"
"in the lower part of the Myton Member (Uinta C)" and most of the fossils are from "between sandstones A and K" in the local section
there are numerous point localities within the section and around it (Fig. 18), including the Kay quarry
Myton Pocket is in chron 20n based on earlier paleomagnetic studies tied down by a date of 40.26 Ma for the Lapoint Ash (Kelly et al. 2012) (age estimates based on Ogg 2020)
it is at the third major fossiliferous horizon in the Uinta Basin section (Kelly et al. 2012)
"in the lower part of the Myton Member (Uinta C)" and most of the fossils are from "between sandstones A and K" in the local section
there are numerous point localities within the section and around it (Fig. 18), including the Kay quarry
Myton Pocket is in chron 20n based on earlier paleomagnetic studies tied down by a date of 40.26 Ma for the Lapoint Ash (Kelly et al. 2012) (age estimates based on Ogg 2020)
it is at the third major fossiliferous horizon in the Uinta Basin section (Kelly et al. 2012)
Environment
Lithology: siliciclastic (mixed)
Taphonomic context: overbank deposit
Habitat comments: "The parent rock" of the fossils "is composed of grains of silt and clay" and the general lithology is "siltstone and shale"
the fossils are from "fine-grained delta plain deposits" representing "A distributary stream system on a delta plain environment" with "numerous avulsion-type paleochannel fills that are surrounded by argillaceous sediments representing the over-the-bank deposits", and they are found "between distributary stream channels"
there are coprolites "suggesting a possible feeding site or den"
"Mammalian remains have been found mostly as fragments of skulls and jaws with teeth" and "Some postcranial material has also been found... Occasionally partially articulated"
the fossils are from "fine-grained delta plain deposits" representing "A distributary stream system on a delta plain environment" with "numerous avulsion-type paleochannel fills that are surrounded by argillaceous sediments representing the over-the-bank deposits", and they are found "between distributary stream channels"
there are coprolites "suggesting a possible feeding site or den"
"Mammalian remains have been found mostly as fragments of skulls and jaws with teeth" and "Some postcranial material has also been found... Occasionally partially articulated"
Methods
Life forms: carnivores,rodents,ungulates,other small mammals
Sample size: 56 specimens
Museum: Brigham Young University
Sampling comments: there are "fishes, turtles and tortoises, crocodilians, and mammals. Turtles and tortoises are the most common vertebrate fossils" and the fishes include gar scales
the author collected during "the summer of 1980, during which attempts at screening small mammal fossils were unsuccessful", and catalog numbers suggest that these specimens are in the Utah Field House of Natural History collection
the author collected during "the summer of 1980, during which attempts at screening small mammal fossils were unsuccessful", and catalog numbers suggest that these specimens are in the Utah Field House of Natural History collection
Metadata
Sample number: 4609
Contributor: John Alroy
Enterer: John Alroy
Modifier no: John Alroy
Created: 2024-12-13 04:39:29
Modified: 2024-12-14 16:57:01
Abundance distribution
15 species
4 singletons
total count 56
geometric series index: 29.8
Fisher's α: 6.713
geometric series k: 0.8426
Hurlbert's PIE: 0.8877
Shannon's H: 2.4073
Good's u: 0.9317
Each square represents a species. Square sizes are proportional to counts.
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Register
| †Mytonolagus petersoni | 2 | |
| Carnivora indet. | 2 | |
| †Pentacemylus progressus | 8 | |
| †Mytonomeryx scotti | 2 | |
| †Protoreodon pumilus | 11 | |
| †Protoreodon petersoni | 6 | |
| plus 8 Protoreodon sp. | ||
| Diplobunops matthewi = †Agriochoerus matthewi | 2 | |
| †Leptotragulus medius | 7 | |
| †Leptotragulus clarki | 2 | |
| †Protylopus ? annectens | 1 | |
| plus 7 other artiodactyls | ||
| Diplacodon sp. | 1 | |
| †Isectolophus annectens | 6 | |
| Amynodon sp. | 1 | |
| Triplopus sp. | 1 | |
| Rodentia indet. | 4 | |