John Day Unit K2: Chattian, Oregon
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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 | ||||||||||
Mammalia
- Rodentia
- Allomyidae
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Allomys sp.
Marsh 1877
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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
- Florentiamyidae
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Florentiamys sp.
Wood 1936
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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 | ||||||||||
Mammalia
- Rodentia
- Castoridae
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Capacikala gradatus
(Cope 1878)
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Mammalia
- Lagomorpha
- Leporidae
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Palaeolagus haydeni
Leidy 1856
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Mammalia
- Erinaceidae
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Ocajila sp.
Macdonald 1963
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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
- 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 | ||||||||||
Mammalia
- Carnivora
- Canidae
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Enhydrocyon sp.
Cope 1879
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Paraenhydrocyon wallovianus
(Cope 1881)
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Mesocyon brachyops
Merriam 1906
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Cormocyon copei
Wang and Tedford 1992
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Mammalia
- Merycoidodontidae
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Merycochoerus superbus
(Leidy 1870)
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recombined as Promerycochoerus superbus | ||||||||||
"Promerycochoerus" macrostegus
(Cope 1884)
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synonym of Promerycochoerus superbus | ||||||||||
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 | ||||||||||
Paroreodon parvus
(Thorpe 1921)
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original and current combination Eporeodon trigonocephalus parvus | ||||||||||
Mammalia
- Hypertragulidae
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Hypertragulus calcaratus
(Cope 1873)
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Mammalia
- Entelodontidae
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Archaeotherium caninus
(Troxell 1920)
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Mammalia
- Camelidae
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Gentilicamelus sp.
Loomis 1936
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= Gentilicamelus sternbergi
Cope 1879
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Dougherty 1940 | |||||||||
Paratylopus sp.
(Matthew 1904)
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original and current combination Miolabis (Paratylopus) | ||||||||||
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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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, J. Marcot, P. Barrett | 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] |