John Day Unit M: Arikareean, Oregon

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Perissodactyla - Equidae
Miohippus sp. Marsh 1874
Kalobatippus sp. Osborn 1915
Mammalia - Perissodactyla - Chalicotheriidae
Moropus sp. Marsh 1877
Mammalia - Merycoidodontidae
Paroreodon parvus (Thorpe 1921)
original and current combination Eporeodon trigonocephalus parvus
Merycoides sp. Douglass 1907
Merycochoerus superbus (Leidy 1870)
recombined as Promerycochoerus superbus
Oreodontoides oregonensis (Thorpe 1921)
original and current combination Eporeodon (Oreodontoides) oregonensis
Mammalia - Entelodontidae
Daeodon sp. Cope 1878
Mammalia - Camelidae
Gentilicamelus sp. Loomis 1936
    = Gentilicamelus sternbergi Cope 1879
Dougherty 1940
Mammalia - Hypertragulidae
Hypertragulus calcaratus (Cope 1873)
Mammalia - Agriochoeridae
Agriochoerus sp. Leidy 1850
Mammalia - Carnivora - Mustelidae
Oligobunis sp. Cope 1881
Mammalia - Carnivora - Amphicyonidae
Daphoenodon sp. Peterson 1909
Mammalia - Rodentia - Cricetidae
Leidymys sp. Wood 1936
Mammalia - Rodentia - Entoptychidae
Entoptychus wheelerensis Rensberger 1971
Mammalia - Rodentia - Florentiamyidae
Florentiamys sp. Wood 1936
Mammalia - Lagomorpha - Leporidae
Palaeolagus sp. Leidy 1856
Desmatolagus sp. Matthew and Granger 1923
see common names

Geography
Country:United States State/province:Oregon County:Grant
Coordinates: 44.7° North, 119.6° West (view map)
Paleocoordinates:44.4° North, 110.7° West
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
10 m.y. bin:Cenozoic 4-5
Key time interval:Arikareean
Age range of interval:29.50000 - 18.50000 m.y. ago
Stratigraphy
Formation:John Day Member:Kimberly
Local section:JohnD Local bed:10
Local order:bottom to top
Stratigraphic resolution:member
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: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)
Metadata
Also known as:Upper Kimberly Member; Upper Roundup Flat Section
Database number:93080
Authorizer:J. Alroy, J. Marcot Enterer:J. Alroy, J. Marcot
Modifier:T. Cleary Research group:vertebrate
Created:2009-12-28 12:35:34 Last modified:2016-07-21 11:31:07
Access level:the public Released:2009-12-28 12:35:34
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:

13795% 46400J. F. Dougherty. 1940. Skull and skeletal remains of the camel Paratylopus cameloides (Wortman) from the John Day deposits, Oregon. Carnegie Institution of Washington Publication 514(4):49-58 [J. Alroy/J. Alroy/W. Clyde]