John Day Unit L: Monroecreekian - Harrisonian, Oregon

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Rhineuridae
Dyticonastis rensbergeri Berman 1976
Berman 1976 1 specimen
"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
Mammalia - Carnivora - Mustelidae
Oligobunis sp. Cope 1881
may include "O. crassivultus" of Fremd et al. 194
Corumictis wolsani Paterson et al. 2020
Paterson et al. 2020
Mammalia - Entelodontidae
Daeodon sp. Cope 1878
may include "Daeodon (Elotherium) calkinsi" of Fremd et al. 1994 (presumably the type of Sinclair)
Mammalia - Camelidae
Gentilicamelus sp. Loomis 1936
    = Gentilicamelus sternbergi Cope 1879
Dougherty 1940
Mammalia - Merycoidodontidae
Merycochoerus superbus (Leidy 1870)
may include "Promerycochoerus latidens," "P. leidyi," "and "P. inflatus" of Fremd et al. 1994
"Promerycochoerus" macrostegus (Cope 1884)
Oreodontoides oregonensis (Thorpe 1921)
Merycoides sp. Douglass 1907
may include "M. pariogonus" and "M. cursor sensu Lander, 1982" of Fremd et al. 1994
Paroreodon parvus (Thorpe 1921)
"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
Mammalia - Agriochoeridae
Agriochoerus sp. Leidy 1850
may include "A. bullatus" and/or "A. trifrons" of Fremd et al. 1994
Mammalia - Hypertragulidae
Hypertragulus calcaratus (Cope 1873)
Mammalia - Perissodactyla - Equidae
Kalobatippus sp. Osborn 1915
may include "K. praestans" of Fremd et al. 1994
Miohippus sp. Marsh 1874
may include "M. primus" of Fremd et al. 1994
Mammalia - Lagomorpha - Leporidae
Palaeolagus sp. Leidy 1856
Desmatolagus sp. Matthew and Granger 1923
Mammalia - Rodentia - Cricetidae
Leidymys sp. Wood 1936
may include "L. nematodon" of Fremd et al. 1994
Mammalia - Rodentia - Florentiamyidae
Florentiamys sp. Wood 1936
Mammalia - Rodentia - Entoptychidae
Entoptychus wheelerensis Rensberger 1971
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
see common names

Geography
Country:United States State/province:Oregon County:Grant
Coordinates: 44.7° North, 119.6° West (view map)
Paleocoordinates:49.2° North, 105.4° West (Wright 2013)
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period: Paleogene Epoch: Oligocene
Stage: Chattian 10 m.y. bin: Cenozoic 4 - Cenozoic 4-5
*Period:Tertiary
Key time interval: Monroecreekian - Harrisonian
Age range of interval: 24.7 - 18.5 m.y. ago
Age estimate: 25.3 to 22.6 Ma (Ar/Ar)
* legacy (obsolete) database fields
Stratigraphy
Formation:John Day Member:Kimberly
Local section:John Day Local bed:9
Local order:bottom to top
Stratigraphic resolution:member
Stratigraphy 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)
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:"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
Metadata
Also known as:Lower Kimberly Member; Upper Roundup Flat Section
Database number:17528
Authorizer:J. Alroy, M. Uhen, P. Barrett, J. Marcot Enterer:J. Alroy, T. Cleary, J. Marcot, M. Uhen
Modifier:B. Allen Research group:vertebrate
Created:1994-04-30 00:00:00 Last modified:2025-02-22 15:12:02
Access level:the public Released:1994-04-30 00:00:00
Creative Commons license:CC0
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:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]
18263 D. S. Berman. 1976. A new amphisbaenian (Reptilia: Amphisbaenia) from the Oligocene-Miocene John Day Formation, Oregon,. Journal of Paleontology 50(1):165-174 [C. Bell/C. Bell]
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]
1547 T. Fremd. 1994. John Day Basin paleontology field trip guide and road log: Society of Vertebrate Paleontology. John Day Fossil Beds National Monument 94-1 [J. Alroy/J. Alroy/M. Uhen]
71997 R. Paterson, J. X. Samuels, N. Rybczynski, M. J. Ryan, and H. C. Maddin. 2020. The earliest mustelid in North America. Zoological Journal of the Linnean Society 188:1318-1339 [M. Uhen/M. Uhen]