Halfway Hollow (Lapoint Member): Duchesnean, Utah
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Protictops alticuspidens
Peterson 1934
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= Geolabidae indet.
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Alroy 2002 | |||||||||
| 14 mi W of Vernal in the "Lapoint Horizon"; "possibly a synonym of Centetodon" according to Emry 1981; considered a nomen dubium by Lillegraven et al. 1981 | ||||||||||
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Mammalia
- Rodentia
- Cylindrodontidae
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Pareumys guensburgi n. sp.
Black 1970
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Black 1970 | 2 specimens | ||||||||
| coordinates show that this is in Halfway Hollow (1 measurement) | ||||||||||
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Mammalia
- Rodentia
- Eomyidae
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Protadjidaumo typus n. sp.
Burke 1934
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Burke 1934 | |||||||||
| from "Lapoint horizon... Fourteen miles west of Vernal... one-half mile north of Vernal-Lapoint road" (1 measurement) | ||||||||||
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Mammalia
- Carnivora
- Miacidae
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Miocyon sp.
(Matthew 1909)
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Bryant 1992 | |||||||||
| "Miacidae or Amphicyonidae" of Emry 1981 from lower Lapoint Mbr. in Halfway Hollow; i.d. seconded by Hunt 1996 | ||||||||||
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Mammalia
- Agriochoeridae
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Agriochoerus maximus
Douglass 1902
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Emry 1981 | |||||||||
| lower Lapoint Mbr. in Halfway Hollow DUPLICATE REF 1438 or 1439 | ||||||||||
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Mammalia
- Perissodactyla
- Rhinocerotidae
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Penetrigonias dakotensis
(Peterson 1920)
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Prothero 2005 | |||||||||
| "Lapoint fauna, Uinta Basin, Utah" | ||||||||||
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Mammalia
- Perissodactyla
- Hyracodontidae
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Hyracodon primus n. sp.
Peterson 1934
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= Hyracodon medius
Peterson 1934
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Alroy 2002 | |||||||||
| "One-half mile north of the Vernal-Lapoint road, about fourteen miles west of Vernal" in the "Lapoint Horizon" | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Utah | County: | Uintah |
| Coordinates: | 40.2° North, 109.9° West (view map) | ||||
| Paleocoordinates: | 42.3° North, 100.7° West | ||||
| Basis of coordinate: | based on political unit |
Time
| Period: | Paleogene | Epoch: | Eocene |
| 10 m.y. bin: | Cenozoic 3 | ||
| *Period: | Tertiary | ||
| Key time interval: | Duchesnean | ||
| Age range of interval: | 39.70000 - 37.00000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Duchesne River | ||
| Local section: | Uinta | Local bed: | 9 |
| Local order: | bottom to top | ||
| Stratigraphic resolution: | member |
Lithology and environment
| Environment: | terrestrial indet. |
Taphonomy
| Modes of preservation: | body |
Collection methods and comments
| Collection excludes: | some genera |
| Taxonomic list comments:lists of Kay 1957 and Emry 1981 do not pertain to individual localities in the Lapoint Mbr.; most of the other records are from Titanothere Quarry in Twelve Mile Wash, about two miles to the east NOTE: this is NOT equivalent to the Halfway Fauna, synonym of the Dry Gulch Creek Member fauna (see) zircon FT dates of 32.2 +/- 3.2, 28.7 +/- 2.0, 33.7 +/- 5.6, 32.9 +/- 4.5, 35.2 +/- 1.6, and 36.9 +/- 1.8 Ma reported by Bryant et al. 1989 are discordant with much more precise K-Ar and Ar-Ar dates reported by Prothero and Swisher 1992; best date is one of 39.74 +/- 0.07 Ma (Ar-Ar) for the Lapoint Tuff, "at the contact between the Dry Gulch Creek and Lapoint Members" Lapoint Mbr. records of unclear status: "Diplobunops (?)" Peterson 1931d from "well up in the Duchesne... in Half-way Hollow"; "Dyscritochoerus lapointensis" type of Gazin 1956b; same as "Helohyus (?)" of Peterson 1934b from "Lapoint Horizon" (no other data) "Epitriplopus medius" Peterson 1934b: referred specimens from "well up in the Duchesne Oligocene... Lapoint horizon" (no other data, but not the Titanothere Quarry); apparently overlooked by Emry 1981, who excludes this species from the Lapoint Duchesnehippus intermedius Rasmussen et al. 1999b: new specimen from "the Lapoint Member" Protoreodon cf. pumilus Rasmussen et al. 1999b: new specimens from "the Lapoint fauna" Mytonomys robustus Wood 1962: "C.M. 9343 from the Duchesne River... Duchesnean" I have failed to find any later mention of the first and third of these specimens (CM 11853 and 11916) | |
Metadata
| Database number: | 16847 | ||
| Authorizer: | J. Alroy, J. Marcot | Enterer: | J. Alroy, J. Marcot | Research group: | vertebrate |
| Created: | 1998-09-21 00:00:00 | Last modified: | 2002-06-03 03:27:41 |
| Access level: | the public | Released: | 1998-09-21 00:00:00 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 2771. | O. A. Peterson. 1934. List of species and description of new material from the Duchesne River Oligocene, Uinta Basin, Utah. Annals of Carnegie Museum 23(7):373-389 [J. Alroy/J. Alroy/J. Marcot] |
Secondary references:
| 6294 | J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari] | |
| 1089 | C. C. Black. 1970. A New Pareumys (Rodentia: Cylindrodontidae) from the Duchesne River Formation, Utah. Fieldiana 16(17) [J. Alroy/J. Alroy/J. Ju] | |
| 1141 | H. N. Bryant. 1992. The Carnivora of the Lac Pelletier Lower Fauna (Eocene Duchesnean), Cypress Hills Formation, Saskatchewan. Journal of Paleontology 66(5):847-855 [J. Alroy/J. Alroy/J. Marcot] | |
| 1153 | J. J. Burke. 1934. New Duchesne River Rodents and a Preliminary Survey of the Adjidaumidae. Annals of Carnegie Museum 23:391-398 [J. Alroy/J. Alroy/J. Ju] | |
| 1438 | R. J. Emry. 1981. New material of the Oligocene muroid rodent Nonomys, and its bearing on muroid origins. American Museum Novitates 2712:1-14 [J. Alroy/J. Alroy/P. Mannion] | |
| 51726 | D. R. Prothero. 2005. The Evolution of North American Rhinoceroses. 1-218 [J. Marcot/J. Marcot] |