PBDB Collection

John Day Unit A (Oligocene of the United States)

Also known as Lower Blue Basin Section

Where: Grant County, Oregon (44.6° N, 119.6° W: paleocoordinates 44.4° N, 108.5° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Turtle Cove Member (John Day Formation), Whitneyan (33.3 - 30.8 Ma)

• SCLF AA date of "30.0?" Ma on A-B Tuff

• member-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Primary reference: 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]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 17349: authorized by John Alroy, entered by John Alroy on 26.03.1995

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Mammalia
Theriamorpha - Herpetotheriidae	Herpetotherium merriami Herpetotherium merriami Stock and Furlong 1922 marsupial presumably includes the type of Stock and Furlong 1922 from Logan Butte
Perissodactyla - Equidae	Miohippus sp., Mesohippus sp. Miohippus sp. Marsh 1874 anchitheriine horse Mesohippus sp. Marsh 1875 anchitheriine horse
Perissodactyla - Rhinocerotidae	Diceratherium sp. Diceratherium sp. Marsh 1875 rhinoceros may include "D. armatum" and/or "D. annectens" of Fremd 1994
Artiodactyla - Entelodontidae	Archaeotherium caninus Archaeotherium caninus Troxell 1920 even-toed ungulate "Entelodon sp." of Fremd 1994 (see Foss and Fremd 1998)
Artiodactyla - Hypertragulidae	Hypertragulus hesperius Hypertragulus hesperius Hay 1902 ruminant
Artiodactyla - Agriochoeridae	"Agriochoerus guyotianus" = Agriochoerus guyotianus, "Agriochoerus macrocephalus" = Agriochoerus guyotianus "Agriochoerus guyotianus" = Agriochoerus guyotianus Cope 1878 agriochoerid "Agriochoerus macrocephalus" = Agriochoerus guyotianus Cope 1878 agriochoerid
Artiodactyla - Merycoidodontidae	"Eporeodon occidentalis" = Eporeodon occidentalis, "Eucrotaphus trigonocephalus" = Eporeodon occidentalis¹ "Eporeodon occidentalis" = Eporeodon occidentalis Marsh 1873 oreodont "Eucrotaphus trigonocephalus" = Eporeodon occidentalis¹ Marsh 1873 oreodont includes "E. condoni"; omitted by Albright et al. 2008; possibly from units B/C
Artiodactyla - Tayassuidae	Thinohyus lentus, Perchoerus probus Thinohyus lentus Marsh 1875 peccary Perchoerus probus Leidy 1856 peccary includes "P. osmonti" and "P. sp." of Fremd et al. 1994
Carnivora - Nimravidae	Nimravus brachyops, Hoplophoneus strigidens Nimravus brachyops Cope 1878 false sabre-tooth "Nimravus debilis" of Fremd 1994 Hoplophoneus strigidens Cope 1878 false sabre-tooth
Carnivora -	Allocyon loganensis Allocyon loganensis Merriam 1930 carnivoran presumably the type of Merriam 1930 from Logan Butte, Crook Co.
Carnivora - Amphicyonidae	Temnocyon altigenis Temnocyon altigenis Cope 1878 bear-dog
Carnivora - Canidae	Enhydrocyon prolatus, Phlaocyon latidens, Archaeocyon pavidus² Enhydrocyon prolatus canid Phlaocyon latidens Cope 1881 bone-crushing dog present in unit A and unit B: Wang et al. 1999 Archaeocyon pavidus² Stock 1933 bone-crushing dog "Picture Gorge 30, Blue Basin level 1, UCMP loc. V4849-1... basal Turtle Cove"; probably includes third "Nothocyon sp."
Rodentia - Allomyidae	"Allomys liolophus" = Haplomys liolophus¹ "Allomys liolophus" = Haplomys liolophus¹ Cope 1881 rodent omitted by Albright et al. 2008; possibly from units B/C
Rodentia - Eomyidae	Eomyidae indet.¹ Eomyidae indet.¹ Winge 1887 rodent omitted by Albright et al. 2008; possibly from units B/C

¹Fremd 1994; ²Wang et al. 1999