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
•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 | |
Palaeolagus sp. Leidy 1856 rabbit | |
Florentiamys sp. Wood 1936 rodent | |
Paciculus sp. Cope 1879 rodent
Leidymys sp. Wood 1936 rodent | |
Capacikala gradatus Cope 1878 beaver | |
Entoptychus sp. Cope 1878 rodent may include "E. basilaris" and/or "E. wheelerensis" of Fremd et al. 1994
| |
Allomys sp. Marsh 1877 rodent | |
| |
Merycoides sp., Paroreodon sp., Hypsiops sp., "Merycochoerus superbus" = Promerycochoerus superbus, Oreodontoides oregonensis
Merycoides sp. Douglass 1907 oreodont may include "M. pariogonus" = "M. cursor sensu Lander, 1982" if Fremd et al. 1994
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
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
Oreodontoides oregonensis Thorpe 1921 oreodont | |
Paratylopus sp. Matthew 1904 camel | |
Hypertragulus calcaratus Cope 1873 ruminant | |
Miohippus sp. Marsh 1874 anchitheriine horse | |
| |
Mesocyon brachyops Merriam 1906 canid
Paraenhydrocyon wallovianus Cope 1881 canid | |
Paradaphoenus cuspigerus Cope 1878 bear-dog | |
Ocajila sp. Macdonald 1963 hedgehog |