John Day Units G, H, I, and J: Geringian, Oregon

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Primates - Ekgmowechashalidae
Ekgmowechashala sp. Macdonald 1963
said by Fremd et al. 1994 to be from unit K
Mammalia - Rodentia - Sciuridae
Sciurus vortmani n. sp. Cope 1879
Cope 1879
recombined as Protospermophilus vortmani
omitted by Albright et al. 2008
Mammalia - Rodentia - Aplodontidae
Meniscomys uhtoffi Rensberger 1983
Mammalia - Rodentia - Allomyidae
Allomys simplicidens Rensberger 1983
Fremd 1994
listed as "Allomys" by Albright et al. 2008
Alwoodia magna Rensberger 1983
Mammalia - Rodentia - Castoridae
Capacikala gradatus (Cope 1878)
Mammalia - Rodentia - Geomyidae
Pleurolicus sulcifrons Cope 1878
Mammalia - Rodentia
Florentiamys lulli Wood 1936
Fremd 1994
recombined as Jimomys lulli
listed as "Florentiamys" by Albright et al. 2008
Mammalia - Perissodactyla - Equidae
Miohippus sp. Marsh 1874
Fremd 1994
Anchitherium equiceps n. sp. Cope 1878
Cope 1879
recombined as Miohippus equiceps
Osborn 1918 states "Diceratherium Zone"
Anchitherium brachylophum n. sp. Cope 1878
Cope 1879
synonym of Miohippus equiceps
Osborn 1918 states "Diceratherium Zone"
Miohippus intermedius (Osborn and Wortman 1895)
Fremd 1994
listed as "Miohippus" by Albright et al. 2008
Miohippus primus n. sp. Osborn 1918
Osborn 1918
Osborn 1918 states "Diceratherium Zone"
Mammalia - Perissodactyla - Rhinocerotidae
Diceratherium armatum Marsh 1875
Fremd 1994
listed as "Diceratherium" by Albright et al. 2008
Diceratherium annectens (Marsh 1873)
Fremd 1994
Mammalia - Hypertragulidae
Nanotragulus planiceps (Sinclair 1905)
recombined as Hypertragulus planiceps
Hypertragulus hesperius Hay 1902
Mammalia - Entelodontidae
Archaeotherium sp. Leidy 1850
Choerodon caninus n. sp. Troxell 1920
Foss and Fremd 1998
recombined as Archaeotherium caninus
YPM 11665; Foss and Fremd 1998 show it between Deep Creek Tuff and Picture Gorge Ignimbrite
Mammalia - Merycoidodontidae
Eporeodon occidentalis (Marsh 1873)
Oreodontoides oregonensis (Thorpe 1921)
original and current combination Eporeodon (Oreodontoides) oregonensis
Promerycochoerus minor Douglass 1903
recombined as Mesoreodon minor
as "Merycochoerus minor": genus assignment unjustified
Mammalia - Carnivora - Canidae
Cormocyon copei Wang and Tedford 1992
units G, H, I, and J: Wang et al. 1999
Rhizocyon oregonensis (Merriam 1906)
present in Bed J: Wang et al. 1999
Mesocyon brachyops Merriam 1906
Enhydrocyon stenocephalus Cope 1879
Philotrox condoni Merriam 1906
Mammalia - Carnivora - Amphicyonidae
Daphoenus sp. Leidy 1853
Mammalia - Carnivora - Nimravidae
Nimravus brachyops (Cope 1878)
see common names

Geography
Country:United States State/province:Oregon County:Wheeler
Coordinates: 44.7° North, 119.7° West (view map)
Paleocoordinates:44.3° North, 110.3° West
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period:Paleogene Epoch:Oligocene
10 m.y. bin:Cenozoic 4
*Period:Tertiary
Key time interval:Geringian
Age range of interval:29.50000 - 24.70000 m.y. ago
Age estimate:28.7 to 27.5 Ma (Ar/Ar)
* legacy (obsolete) database fields
Stratigraphy
Formation:John Day Member:Turtle Cove
Local section:John Day Local bed:6
Local order:bottom to top
Stratigraphic resolution:member
Stratigraphy comments: bracketed by AA dates of 28.7 Ma (Picture Gorge Tuff) and 27.5 Ma (Picture Gorge Ignimbrite); average is 28.1
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:"Cynodictis angustidens" is listed by Fremd et al. 1994, but this usage unjustified and the species is invalid
"Nothocyon sp." is also listed but omitted (understandably) by Albright et al. 1994
Fremd et al. list the following dubious oreodonts that are omitted by Albright et al. 2008: Eucrotaphus trigonocephalus, "Mesoreodon major" = Merycoidodon major, and "Desmatochoerus curvidens" = D. megalodon
Metadata
Also known as:Longview Ranch Airport Section; Diceratherium Zone of authors
Database number:17537
Authorizer:J. Alroy, J. Marcot Enterer:J. Alroy, J. Marcot
Modifier:J. Marcot Research group:vertebrate
Created:1995-03-26 00:00:00 Last modified:2024-05-15 12:00:35
Access level:the public Released:1995-03-26 00:00:00
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:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]
53289 E. D. Cope. 1879. Observations on the faunae of the Miocene Tertiaries of Oregon. Bulletin of the United States Geological and Geographical Survey 5(2):55-69 [M. Carrano/M. Carrano]
53291 E. D. Cope. 1879. Second contribution to a knowledge of the Miocene fauna of Oregon. Paleontological Bulletin 31:1-7 [M. Carrano/M. Carrano]
1505 S. E. Foss and T. Fremd. 1998. A Survey Of The Species Of Entelodonts (Mammalia, Artiodactyla) Of The John Day Basin, Oregon. Dakoterra 5:63-72 [J. Alroy/J. Alroy/J. Marcot]
1547 T. Fremd. 1994. John Day Basin paleontology field trip guide and road log: Society of Vertebrate Paleontology. John Day Fossil Beds National Monument 94-1 [J. Alroy/J. Alroy/M. Uhen]
43835% 38200E. Mitchell and R. H. Tedford. 1973. The Enaliarctinae: A new group of extinct aquatic carnivora and a consideration of the origin of the otariidae. Bulletin of the American Museum of Natural History 151(3):203-284 [M. Uhen/M. Uhen/M. Uhen]
2702 H. F. Osborn. 1918. Equidae of the Oligocene, Miocene, and Pliocene of North America, iconographic type revision. Memoirs of the American Museum of Natural History 2(1):1-217 [J. Alroy/J. Alroy/J. Marcot]