Quinn Draw (Middle Titanotherium Beds) (Eocene of the United States)

Where: Shannon County, South Dakota (43.3° N, 102.5° W: paleocoordinates 44.6° N, 93.7° W)

• coordinate based on political unit

When: Chadron Formation, Chadronian (37.2 - 33.9 Ma)

• member-level stratigraphic resolution

Environment/lithology: terrestrial

Primary reference: H. F. Osborn. 1902. The four phyla of Oligocene titanotheres. Bulletin of the American Museum of Natural History 16(8):91-109 [J. Alroy/J. Alroy/T. Liebrecht]more details

PaleoDB collection 17013: authorized by John Alroy, entered by John Alroy on 18.10.1995, edited by Evangelos Vlachos

Creative Commons license: CC BY (attribution)

Taxonomic list

• relationship of unit to members of Clark and Beerbower 1967 unclear
Reptilia
 Testudines - Pangeoemydidae
"Graptemys cordifera n. sp." = Echmatemys lativertebralis2
"Graptemys cordifera n. sp." = Echmatemys lativertebralis2 Cope 1877 turtle
YPM VPPU 013838 (holotype), an almost complete shell (Clark 1937, figs. 11, 12)
Mammalia
 Perissodactyla - Brontotheriidae
Brontops bicornutus1 Osborn 1902 brontothere
 Ungulata - Leptochoeridae
Leptochoerus elegans3 Macdonald 1955 even-toed ungulate
"Middle Member" at Quinn Draw, Pennington Co.