John Day Unit K2: Chattian, Oregon
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Reptilia
- Rhineuridae
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Dyticonastis rensbergeri
Berman 1976
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Berman 1976 | 5 specimens | ||||||||
| "from late Arikareean and from the uppermost levels of the Turtle Cove Member, above the Picture Gorge ignimbrite": UCMP 76878, most of anterior half of skull; UCMP 76879, nearly complete skull with mandibles and atlas; UCMP 76880, badly eroded posterior half of skull; UCMP 76884, partial skull consisting mainly of otic-occip region; UCMP 80388, nearly complete anterior half of skull with mandibles | ||||||||||
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Mammalia
- Carnivora
- Amphicyonidae
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Daphoenus sp.
Leidy 1853
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Paradaphoenus cuspigerus
(Cope 1878)
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Mammalia
- Carnivora
- Canidae
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Cormocyon copei
Wang and Tedford 1992
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Mesocyon brachyops
Merriam 1906
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Enhydrocyon sp.
Cope 1879
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Paraenhydrocyon wallovianus
(Cope 1881)
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Mammalia
- Carnivora
- Nimravidae
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Pogonodon sp.
Cope 1880
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Bryant and Fremd 1998 | |||||||||
| Unit K2, Lone Rock; type of P. davisi is probably from Unit K | ||||||||||
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Mammalia
- Perissodactyla
- Equidae
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Miohippus sp.
Marsh 1874
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Mammalia
- Perissodactyla
- Rhinocerotidae
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Diceratherium sp.
Marsh 1875
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Mammalia
- Entelodontidae
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Archaeotherium caninus
(Troxell 1920)
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Mammalia
- Merycoidodontidae
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Hypsiops sp.
Schultz and Falkenbach 1950
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Merycoides sp.
Douglass 1907
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Oreodontoides oregonensis
(Thorpe 1921)
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| original and current combination Eporeodon (Oreodontoides) oregonensis | ||||||||||
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Merycochoerus superbus
(Leidy 1870)
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| recombined as Promerycochoerus superbus | ||||||||||
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"Promerycochoerus" macrostegus
(Cope 1884)
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| synonym of Promerycochoerus superbus | ||||||||||
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Paroreodon parvus
(Thorpe 1921)
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| original and current combination Eporeodon trigonocephalus parvus | ||||||||||
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Mammalia
- Camelidae
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Paratylopus sp.
(Matthew 1904)
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| original and current combination Miolabis (Paratylopus) | ||||||||||
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Gentilicamelus sp.
Loomis 1936
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= Gentilicamelus sternbergi
Cope 1879
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Dougherty 1940 | |||||||||
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Mammalia
- Hypertragulidae
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Hypertragulus calcaratus
(Cope 1873)
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Mammalia
- Erinaceidae
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Ocajila sp.
Macdonald 1963
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Mammalia
- Lagomorpha
- Leporidae
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Palaeolagus haydeni
Leidy 1856
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Mammalia
- Rodentia
- Florentiamyidae
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Florentiamys sp.
Wood 1936
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Mammalia
- Rodentia
- Cricetidae
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Leidymys sp.
Wood 1936
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Paciculus sp.
Cope 1879
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Mammalia
- Rodentia
- Allomyidae
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Allomys sp.
Marsh 1877
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Mammalia
- Rodentia
- Entoptychidae
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Entoptychus sp.
Cope 1878
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| E. basilaris and/or E. wheelerensis | ||||||||||
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Mammalia
- Rodentia
- Castoridae
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Capacikala gradatus
(Cope 1878)
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| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Oregon | County: | Grant |
| Coordinates: | 44.7° North, 119.6° West (view map) | ||||
| Paleocoordinates: | 44.4° North, 110.7° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Oligocene |
| Stage: | Chattian | 10 m.y. bin: | Cenozoic 4 |
| Key time interval: | Chattian | ||
| Age range of interval: | 27.82000 - 23.03000 m.y. ago | ||
| Age estimate: | 27.5 to 25.3 Ma (Ar/Ar) |
Stratigraphy
| Formation: | John Day | Member: | Turtle Cove | ||
| Local section: | JohnD | Local bed: | 8 | ||
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | member | ||||
| Stratigraphy comments: bracketed by SCLF AA dates of 27.5 Ma (Deep Creek Tuff) and 25.3 Ma (Tin Roof Tuff), but Biotite Tuff in middle of unit dated at 27.2 Ma | |||||
Lithology and environment
| Primary lithology: | not reported |
| Environment: | terrestrial indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | biostratigraphic analysis |
| Taxonomic list comments:"Entelodon imperator" is said to be "not valid" | |
Metadata
| Also known as: | Middle Roundup Flat Section | ||
| Database number: | 93079 | ||
| Authorizer: | J. Alroy, P. Barrett, J. Marcot | Enterer: | J. Alroy, T. Cleary, J. Marcot |
| Modifier: | B. Allen | Research group: | vertebrate |
| Created: | 2009-12-28 12:34:15 | Last modified: | 2023-07-29 05:06:36 |
| Access level: | the public | Released: | 2009-12-28 12:34:15 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 31438. | L. B. Albright, M. O. Woodburne, T. J. Fremd, C. C. Swisher, B. J. MacFadden and G. R. Scott. 2008. Revised chronostratigraphy and biostratigraphy of the John Day Formation (Turtle Cove and Kimberly Members), Oregon, with implications for updated calibration of the Arikareean North American land mammal age. 116(3):211-237 [J. Alroy/J. Alroy] |
Secondary references:
| 18263 | D. S. Berman. 1976. A new amphisbaenian (Reptilia: Amphisbaenia) from the Oligocene-Miocene John Day Formation, Oregon,. Journal of Paleontology 50(1):165-174 [C. Bell/C. Bell] | |
| 1379 | 5% 46400 | J. F. Dougherty. 1940. Skull and skeletal remains of the camel Paratylopus cameloides (Wortman) from the John Day deposits, Oregon. Carnegie Institution of Washington Publication 514(4):49-58 [J. Alroy/J. Alroy/W. Clyde] |