John Day Unit M ( of the United States)

Also known as Upper Kimberly Member; Upper Roundup Flat Section

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: Kimberly Member (John Day Formation), Arikareean (29.5 - 18.5 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 93080: authorized by John Alroy, entered by John Alroy on 28.12.2009, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• 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)
"Moropus ? oregonensis" is probably based on UNSM specimen from Johnson Canyon (see)
Show authors, comments, and common names
Mammalia
 Perissodactyla - Chalicotheriidae
Moropus sp.
Moropus sp. Marsh 1877 chalicothere
 Perissodactyla - Equidae
Kalobatippus sp., Miohippus sp.
Kalobatippus sp. Osborn 1915 anchitheriine horse
Miohippus sp. Marsh 1874 anchitheriine horse
 Artiodactyla - Camelidae
Gentilicamelus sternbergi
 Artiodactyla - Merycoidodontidae
Paroreodon parvus, Merycoides sp., "Merycochoerus superbus" = Promerycochoerus superbus, Oreodontoides oregonensis, Hypsiops sp.
Paroreodon parvus Thorpe 1921 oreodont
Merycoides sp. Douglass 1907 oreodont
"Merycochoerus superbus" = Promerycochoerus superbus Leidy 1870 oreodont
Oreodontoides oregonensis Thorpe 1921 oreodont
Hypsiops sp. Schultz and Falkenbach 1950 oreodont
 Artiodactyla - Entelodontidae
Daeodon sp.
Daeodon sp. Cope 1878 even-toed ungulate
 Artiodactyla - Hypertragulidae
Hypertragulus calcaratus
Hypertragulus calcaratus Cope 1873 ruminant
 Artiodactyla - Agriochoeridae
Agriochoerus sp.
Agriochoerus sp. Leidy 1850 agriochoerid
 Carnivora - Amphicyonidae
Daphoenodon sp.
Daphoenodon sp. Peterson 1909 bear-dog
 Carnivora - Mustelidae
Oligobunis sp.
Oligobunis sp. Cope 1881 mustelid carnivore
 Rodentia - Cricetidae
Leidymys sp.
Leidymys sp. Wood 1936 rodent
 Rodentia - Entoptychidae
Entoptychus wheelerensis
Entoptychus wheelerensis Rensberger 1971 rodent
 Rodentia - Florentiamyidae
Florentiamys sp.
Florentiamys sp. Wood 1936 rodent
 Lagomorpha - Leporidae
Desmatolagus sp., Palaeolagus sp.
Desmatolagus sp. Matthew and Granger 1923 rabbit
Palaeolagus sp. Leidy 1856 rabbit