Also known as Middle 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: 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 93079: authorized by John Alroy, entered by John Alroy on 28.12.2009, edited by Terri Cleary and Jonathan Marcot
Creative Commons license: CC BY (attribution)
Taxonomic list
| Reptilia | |
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Dyticonastis rensbergeri1 Berman 1976 worm lizard "from late Arikareean and from the uppermost levels of the Turtle Cove Member, above the Picture Gorge ignimbrite": UCMP 76878, most of anterior half of skull; UCMP 76879, nearly complete skull with mandibles and atlas; UCMP 76880, badly eroded posterior half of skull; UCMP 76884, partial skull consisting mainly of otic-occip region; UCMP 80388, nearly complete anterior half of skull with mandibles
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| Mammalia | |
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Palaeolagus haydeni Leidy 1856 rabbit | |
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Leidymys sp. Wood 1936 mouse
Paciculus sp. Cope 1879 mouse | |
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Allomys sp. Marsh 1877 rodent | |
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Capacikala gradatus Cope 1878 beaver | |
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Florentiamys sp. Wood 1936 rodent | |
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Miohippus sp. Marsh 1874 anchitheriine horse | |
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Diceratherium sp. Marsh 1875 rhinoceros | |
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Hypertragulus calcaratus Cope 1873 ruminant | |
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Paratylopus sp. Matthew 1904 camel | |
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Archaeotherium caninus Troxell 1920 even-toed ungulate | |
Merycoides sp., Paroreodon parvus, Oreodontoides oregonensis, "Merycochoerus superbus" = Promerycochoerus superbus, ""Promerycochoerus" macrostegus" = Promerycochoerus superbus, Hypsiops sp.
Merycoides sp. Douglass 1907 oreodont
Paroreodon parvus Thorpe 1921 oreodont
Oreodontoides oregonensis Thorpe 1921 oreodont
"Merycochoerus superbus" = Promerycochoerus superbus Leidy 1870 oreodont
""Promerycochoerus" macrostegus" = Promerycochoerus superbus Leidy 1870 oreodont
Hypsiops sp. Schultz and Falkenbach 1950 oreodont | |
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Cormocyon copei Wang and Tedford 1992 bone-crushing dog
Mesocyon brachyops Merriam 1906 canid
Enhydrocyon sp. Cope 1879 canid
Paraenhydrocyon wallovianus Cope 1881 canid | |
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Paradaphoenus cuspigerus Cope 1878 bear-dog
Daphoenus sp. Leidy 1853 bear-dog | |
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Pogonodon sp.2 Cope 1880 false sabre-tooth Unit K2, Lone Rock; type of P. davisi is probably from Unit K
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Ocajila sp. Macdonald 1963 hedgehog | |