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 | |
Paradaphoenus cuspigerus Cope 1878 bear-dog | |
Paraenhydrocyon wallovianus Cope 1881 canid
Mesocyon brachyops Merriam 1906 canid | |
Miohippus sp. Marsh 1874 anchitheriine horse | |
| |
Paratylopus sp. Matthew 1904 camel | |
Merycoides sp., Paroreodon sp., Hypsiops sp., Oreodontoides oregonensis, "Merycochoerus superbus" = Promerycochoerus superbus
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"
Oreodontoides oregonensis Thorpe 1921 oreodont
"Merycochoerus superbus" = Promerycochoerus superbus Leidy 1870 oreodont | |
| |
Hypertragulus calcaratus Cope 1873 ruminant | |
Ocajila sp. Macdonald 1963 hedgehog | |
Capacikala gradatus Cope 1878 beaver | |
Leidymys sp. Wood 1936 mouse
Paciculus sp. Cope 1879 mouse | |
Allomys sp. Marsh 1877 rodent | |
Entoptychus sp. Cope 1878 rodent may include "E. basilaris" and/or "E. wheelerensis" of Fremd et al. 1994
| |
Florentiamys sp. Wood 1936 rodent | |
Palaeolagus sp. Leidy 1856 rabbit |