Twin Obo (Ulan Gochu horizon) (Oligocene of China)

Also known as East Mesa; Shara Murun; Twin Oboes; Twin Obes

Where: Nei Mongol, China (43.2° N, 111.3° E: paleocoordinates 44.4° N, 107.8° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: Ulan Gochu Formation, Early/Lower Oligocene (33.9 - 28.4 Ma)

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Collected by Central Asiatic Expedition in 1928; reposited in the AMNH

Primary reference: D. B. Brinkman, J.-L. Li, and X.-K. Ye. 2008. Order Testudines. In J. Li, X. Wu, F. Zhange (eds.), The Chinese Fossil Reptiles and Their Kin 35-102 [D. Nicholson/D. Nicholson/D. Nicholson]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 178876: authorized by David Nicholson, entered by David Nicholson on 19.05.2016, edited by Terri Cleary and Philip Mannion

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Testudines - Pantestudinidae
Testudo nanus n. sp. Gilmore 1931 turtle
AMNH 6692 a complete shell
 Testudines - Panemydidae
Sharemys hemispherica n. sp. Gilmore 1931 turtle
AMNH 6694 a nearly complete carapace and plastron
 Squamata - Arretosauridae
Arretosaurus ornatus n. gen. n. sp.1
Arretosaurus ornatus n. gen. n. sp.1 Gilmore 1943 squamates
AMNH 6706 (holotype), incomplete skull and lower jaws articulated with the anterior portion of the skeleton, including some of the pectoral girdle and one forelimb and foot, and a small patch of skin impression; AMNH 6708, disarticulated skull elements
Mammalia
 Anagalida - Anagalidae
Anagale gobiensis n. gen. n. sp.2
Anagale gobiensis n. gen. n. sp.2 Simpson 1931 placental
AMNH 26079 - holotype