Quinn Draw (Lower Nodular Zone) (Oligocene of the United States)

Where: Shannon County, South Dakota (43.3° N, 102.5° W: paleocoordinates 44.4° N, 94.3° W)

• coordinate based on political unit

When: Scenic Member (Brule Formation), Orellan (33.9 - 33.3 Ma)

• member-level stratigraphic resolution

Environment/lithology: terrestrial

Primary reference: W. D. Matthew. 1905. Notice of two new genera of mammals from the Oligocene of South Dakota. Bulletin of the American Museum of Natural History 21(3):21-26 [J. Alroy/J. Alroy/J. Marcot]more details

PaleoDB collection 17162: authorized by John Alroy, entered by John Alroy on 26.03.1995, edited by Terri Cleary

Creative Commons license: CC BY (attribution)

Taxonomic list

• most of Quinn Draw is in Shannon Co., formerly Washington Co.; the very last mile of it is in Pennington Co.
Mammalia
 Rodentia - Ischyromyidae
Ischyromys sp.1 Leidy 1856 rodent
 Rodentia - Eutypomyidae
Eutypomys thomsoni n. sp. Matthew 1905 rodent
"Lower Oreodon Beds... on Quinn Draw"
 Perissodactyla - Hyracodontidae
Hyracodon sp.1 Leidy 1856 odd-toed ungulate
 Perissodactyla - Tapiridae
Colodon occidentalis7 Leidy 1868 tapir
 Perissodactyla - Equidae
Mesohippus bairdi2 Leidy 1850 anchitheriine horse
two localities within 1 mi E of the head of Quinn Draw in the LNZ
 Artiodactyla - Leptochoeridae
"Nanochoerus elegans n. sp." = Leptochoerus elegans4
"Nanochoerus elegans n. sp." = Leptochoerus elegans4 Macdonald 1955 even-toed ungulate
"lower Oreodon zone, Quinn Draw Basin, Pennington Co."
 Artiodactyla - Merycoidodontidae
"Merycoidodon culbertsoni" = Merycoidodon culbertsonii6, Miniochoerus gracilis5
"Merycoidodon culbertsoni" = Merycoidodon culbertsonii6 Leidy 1848 oreodont
"Merycoidodon culbertsoni osborni": "head of Quinn Draw" Brule Zone A; also includes their "Paramerycoidodon georgei" from "head of Quinn Draw"; "Genetochoerus periculorum" from "head of Quinn Draw"; all Brule Zone A
Miniochoerus gracilis5 Leidy 1851 oreodont
"head of Quinn Draw" Brule Zone A
 Carnivora - Canidae
Hesperocyon gregarius8 Cope 1873 canid
Quinn Draw, base and "near top" of lower nodular zone
Reptilia
 Squamata -
Peltosaurus granulosus3 Cope 1873 squamates
PU 10988, median portions of both rami with numerous fragments of skull dermal scutes and vertebrae. "lower oreodon beds", coll. Hatcher 1894