Cedar Pass (SDSM V712) (Oligocene of the United States)

Where: Jackson County, South Dakota (43.8° N, 101.9° W: paleocoordinates 44.7° N, 94.3° W)

• coordinate stated in text

When: lower Poleslide Member (Brule Formation), Whitneyan (33.3 - 30.8 Ma)

• In this section, the fossils are derived from the Bjork siltstone beds (unit 8 of Evanoff et al. 2010:fig. 3; also see Evanoff et al. 2010 suppl.:fig 11b; Fig. 1). The age of the rocks and fauna are interpreted as early Whitneyan (middle Oligocene). The specimens were recovered from the lower part of the Poleslide Member, which contains a typical Whitneyan Fauna (as defined by Prothero and Emry 2004), and conformably overlies the Orellan Scenic Member of the Brule Formation (Evanoff et al. 2010).

Environment/lithology: terrestrial; lithology not reported

Size classes: macrofossils, mesofossils

Primary reference: W. W. Korth. 2014. Rodents (Mammalia) from the Whitneyan (Middle Oligocene) Cedar Pass Fauna of South Dakota. Annals of Carnegie Museum 82(4):373-398 [J. Marcot/J. Marcot]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 170168: authorized by Jonathan Marcot, entered by Jonathan Marcot on 15.06.2015, edited by Mark Uhen

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Rodentia - Cricetidae
Scottimus lophatus Wood 1937 mouse
Eumys brachyodus Wood 1937 mouse
Leidymys juxtaparvulus Korth 2010 mouse
Leidymys cf. blacki Macdonald 1963 mouse
Paciculus cf. nebraskensis Alker 1969 mouse
Paciculus cedrus n. sp. Korth 2014 mouse
 Rodentia -
Epeiromys sp. Korth 1989 rodent
 Rodentia - Aplodontidae
Disallomys robustus Korth 2009 mountain beaver
Campestrallomys dawsonae Macdonald 1963 mountain beaver
 Rodentia - Sciuridae
Hesperopetes jamesi Emry and Korth 2007 squirrel
Oligospermophilus sp. Korth 1987 squirrel
Douglassciurus bjorki n. sp. Korth 2014 squirrel
 Rodentia - Eomyidae
Eomyidae indet. Winge 1887 rodent
Paradjidaumo trilophus Cope 1873 rodent
 Rodentia - Florentiamyidae
Kirkomys martintau Korth 2008 rodent
 Rodentia - Heteromyidae
Proharrymys wahlerti Korth and Branciforte 2007 rodent
 Rodentia - Castoridae
Agnotocastor praetereadens Stirton 1935 beaver
Palaeocastor wahlerti Korth 2001 beaver
 Rodentia - Eutypomyidae
 Rodentia - Ischyromyidae
Ischyromys typus Leidy 1856 rodent
 Tribosphenida - Proscalopidae
Proscalops tertius Reed 1961 placental