John Day Unit L (Oligocene to of the United States)

Also known as Lower Kimberly Member; Upper Roundup Flat Section

Where: Grant County, Oregon (44.7° N, 119.6° W: paleocoordinates 44.5° N, 111.8° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Kimberly Member (John Day Formation), Monroecreekian to Monroecreekian (26.3 - 24.8 Ma)

• above a well-defined tuff and below the Haystack Mbr.

•not clear if Black Bone Hill (JDNM-50; UCMP 863, V-6666) is at this level or in the Haystack Mbr.

•SCLF AA date of 25.3 Ma (Tin Roof Tuff) at base of unit, and date of 22.6 Ma ("? ATR Tuff") in upper part of unit but not at top; based on figure older date is well below lowest horizon actually exposed in main collecting area (Bone Creek), but it seems most conservative to assume that fauna lies between two dated horizons

•one-sigma error on 22.6 Ma date is 0.13 m.y.: Coombs et al. 2001

•localities with partial faunal lists: Black Bone Hill (JDNM-50; UCMP 863, V-6666) Bone Creek (Drees; Picture Gorge 36; UCMP V-5954, V-76124) - this may be within the Rose Creek Member based on Coombs et al. 2001 Haystack 8 (UCMP V-6322) JDNM-46 (UCMP V-6668)

• 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 17528: authorized by John Alroy, entered by John Alroy on 30.04.1994, edited by Terri Cleary, Mark Uhen and Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• "Moropus ? oregonensis" in list of Fremd et al. 1994 is probably based on UNSM specimen from Johnson Canyon (see)

•unit K records of Fremd et al. 1994 that are omitted by Albright et al. 2008 and therefore cannot be assigned to K1 or K2 include "Peratherium sp.," Micropternodus sp., "Eporeodon condoni," "Protomeryx sp.," "Leptomeryx sp.," Schizodontomys cf. sulcidens, Proheteromys thorpei, and Protosciurus condoni

•"Hesperocyon oregonensis" = Rhizocyon oregonensis, "Pericyon" = Daphoenus socialis, "Protapirus robustus" = Nexuotapirus robustus, "Hypertragulus planiceps" = Nanotragulus planiceps, and "Allomys hippodus" = Meniscomys hippodus are specifically excluded from unit K

Mammalia
 Rodentia - Florentiamyidae
Florentiamys sp. Wood 1936 rodent
 Rodentia - Cricetidae
Leidymys sp. Wood 1936 mouse
may include "L. nematodon" of Fremd et al. 1994
 Rodentia - Entoptychidae
Entoptychus wheelerensis Rensberger 1971 rodent
may include "Palustrimus lewisi," "E. cavifrons," "E. individens," "E. minor," "E. planifrons," "E. productidens," and/or "E. transitorius" of Fremd et al. 1994, as well as "E. sperryi" type mentioned by Rensberger 1971
 Lagomorpha - Leporidae
Palaeolagus sp. Leidy 1856 rabbit
Desmatolagus sp. Matthew and Granger 1923 rabbit
 Perissodactyla - Equidae
Kalobatippus sp. Osborn 1915 anchitheriine horse
may include "K. praestans" of Fremd et al. 1994
Miohippus sp. Marsh 1874 anchitheriine horse
may include "M. primus" of Fremd et al. 1994
 Artiodactyla - Camelidae
Gentilicamelus sternbergi2 Cope 1879 camel
 Artiodactyla - Entelodontidae
Daeodon sp. Cope 1878 even-toed ungulate
may include "Daeodon (Elotherium) calkinsi" of Fremd et al. 1994 (presumably the type of Sinclair)
 Artiodactyla - Agriochoeridae
Agriochoerus sp. Leidy 1850 agriochoerid
may include "A. bullatus" and/or "A. trifrons" of Fremd et al. 1994
 Artiodactyla - Hypertragulidae
Hypertragulus calcaratus Cope 1873 ruminant
 Artiodactyla - Merycoidodontidae
Paroreodon parvus Thorpe 1921 oreodont
"Phenacocoelus parvus" of Fremd et al. 1994 (combination used in no other publication I have seen); may include "Oreodontoides stocki" of Schultz and Falkenbach 1947
Merycoides sp. Douglass 1907 oreodont
may include "M. pariogonus" and "M. cursor sensu Lander, 1982" of Fremd et al. 1994
Oreodontoides oregonensis Thorpe 1921 oreodont
Hypsiops sp. Schultz and Falkenbach 1950 oreodont
"Merycochoerus superbus" = Promerycochoerus superbus Leidy 1870 oreodont
may include "Promerycochoerus latidens," "P. leidyi," "and "P. inflatus" of Fremd et al. 1994
""Promerycochoerus" macrostegus" = Promerycochoerus superbus Leidy 1870 oreodont
 Carnivora - Mustelidae
Oligobunis sp. Cope 1881 mustelid carnivore
may include "O. crassivultus" of Fremd et al. 194
Corumictis wolsani3 Paterson et al. 2020 mustelid carnivore
Reptilia
 Squamata - Rhineuridae
Dyticonastis rensbergeri1 Berman 1976 worm lizard
"Kimberly member": UCMP 76882, incomplete anterior half of skull with mandibles and closely associated series of vertebrae (about 20) with proximal halves of at least 2 ribs