John Day Unit K1 (Oligocene of the United States)

Also known as Lower Roundup Flat Section; JDNM-35; South Haystack; UCMP V-6682

Where: Grant County, Oregon (44.7° N, 119.6° W: paleocoordinates 44.4° N, 110.7° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Turtle Cove Member (John Day Formation), Chattian (28.1 - 23.0 Ma)

• 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

• 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 17603: authorized by John Alroy, entered by John Alroy on 26.03.1995, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• "Entelodon imperator" is said by Fremd et al. 1994 to be "not valid"

•earlier unit K records specifically excluded by Albright et al. 2008 include Paraenhydrocyon josephi, "Hypertragulus" planiceps, "Eporeodon longifrons" = E. occidentalis, "Mesoreodon major" = Merycoidodon major, and Meniscomys hippodus of Fremd et al. 1994, as well as Rhizocyon oregonensis of Wang et al. 1999

•"Sciurus wortmani" = Protospermophilus vortmani of Fremd et al. 1994 comes from somewhere in unit K

Mammalia
 Rodentia - Florentiamyidae
Florentiamys sp. Wood 1936 rodent
 Rodentia - Castoridae
Capacikala gradatus Cope 1878 beaver
 Rodentia - Allomyidae
Allomys sp. Marsh 1877 rodent
 Rodentia - Cricetidae
Paciculus sp. Cope 1879 mouse
Leidymys sp. Wood 1936 mouse
 Rodentia - Entoptychidae
Entoptychus sp. Cope 1878 rodent
may include "E. basilaris" and/or "E. wheelerensis" of Fremd et al. 1994
 Lagomorpha - Leporidae
Palaeolagus sp. Leidy 1856 rabbit
 Theriamorpha - Erinaceidae
Ocajila sp. Macdonald 1963 hedgehog
 Perissodactyla - Rhinocerotidae
Diceratherium sp. Marsh 1875 rhinoceros
may include "D. annectens" of Fremd et al. 1994
 Perissodactyla - Equidae
Miohippus sp. Marsh 1874 anchitheriine horse
 Artiodactyla - Camelidae
Gentilicamelus sternbergi Cope 1879 camel
may include "Paratylopus sterbergii" of Fremd et al. 1994
Paratylopus sp. Matthew 1904 camel
 Artiodactyla - Entelodontidae
Archaeotherium sp. Leidy 1850 even-toed ungulate
see Foss and Fremd 1998
 Artiodactyla - Hypertragulidae
Hypertragulus calcaratus Cope 1873 ruminant
 Artiodactyla - Merycoidodontidae
Paroreodon sp. Thorpe 1921 oreodont
may include "Phenacocoelus parvus" (combination not used in any other publication I have seen) = Paroreodon parvus of Fremd et al. 1994
Merycoides sp. Douglass 1907 oreodont
may include "M. pariogonus" = "M. cursor sensu Lander, 1982" if Fremd et al. 1994
Oreodontoides oregonensis Thorpe 1921 oreodont
Hypsiops sp. Schultz and Falkenbach 1950 oreodont
may include "H. johndayensis" type of Schultz and Falkenbach 1950 from CIT 372 in the "middle or upper John Day"
"Merycochoerus superbus" = Promerycochoerus superbus Leidy 1870 oreodont
 Carnivora - Amphicyonidae
Daphoenus sp. Leidy 1853 bear-dog
from "Sheep Rock area, ?Unit K, Grant Co." according to Hunt 1998
Paradaphoenus cuspigerus Cope 1878 bear-dog
 Carnivora - Canidae
Mesocyon brachyops Merriam 1906 canid
Cormocyon copei Wang and Tedford 1992 bone-crushing dog
see also Wang et al. 1999