Urtyn Obo "Upper Red" Beds (Eocene of China)

Also known as Aliusu; Baluchithere Camp; East Mesa; 4 miles north of Baron Sog Lamasery; Siziwang Banner; Erden Obo; Siziwangqi

Where: Nei Mongol, China (42.6° N, 111.3° E: paleocoordinates 43.6° N, 106.3° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Ulan Gocho Formation, Ulangochuian (37.2 - 33.9 Ma)

• thought to be younger than the Irdin Manha, Shara Murun, and Ardyn Obo, and older than the Houldjin, Hsanda Gol, and Baron Sog

• member-level stratigraphic resolution

Environment/lithology: terrestrial; red sandstone and mudstone

Size classes: macrofossils, mesofossils

Collected in 1928, 2007–2012; reposited in the AMNH, IVPP

Primary reference: H. F. Osborn. 1929. Embolotherium, gen. nov., of the Ulan Gochu, Mongolia. American Museum Novitates 353:1-20 [J. Alroy/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 73811: authorized by John Alroy, entered by John Alroy on 30.06.2007, edited by Philip Mannion

Creative Commons license: CC BY (attribution)

Taxonomic list

 Rodentia - Cricetidae
Pappocricetodon siziwangqiensis n. sp.4 Li et al. 2016 mouse
IVPP V 17806 - type
Eucricetodon sp.4 Thaler 1966 mouse
IVPP V 17809
Eucricetodon wangae n. sp.4 Li et al. 2016 mouse
IVPP V 17807 - type; referred material: IVPP V 17808
 Rodentia - Dipodidae
Heosminthus nomogenesis n. sp.3 Li et al. 2016 rodent
IVPP V 17810 - type; referred material: IVPP V 17811
Allosminthus ernos3 Wang 1985 rodent
IVPP V 17814
Allosminthus cf. majusculus3 Wang 1985 rodent
IVPP V 17813
Allosminthus cf. diconjugatus3 Tong 1997 rodent
IVPP V 17815
Sinosminthus sp.3 Wang 1985 rodent
IVPP V 17812
 Rodentia - Cylindrodontidae
Ardynomys olseni7 Matthew and Granger 1925 rodent
AMNH 22108 and 22109
 Perissodactyla - Brontotheriidae
"Embolotherium loucksii n. sp." = Embolotherium grangeri
"Embolotherium loucksii n. sp." = Embolotherium grangeri Osborn 1929 brontothere
from base of unit
 Perissodactyla - Chalicotheriidae
Schizotherium cf. avitum1 Matthew and Granger 1923 chalicothere
AMNH 103336
 Perissodactyla - Amynodontidae
"Amynodon mongoliensis" = Sharamynodon mongoliensis6 Osborn 1936 odd-toed ungulate
AMNH 21601
Zaisanamynodon borisovi5 Belyaeva 1971 odd-toed ungulate
AMNH 26049
 Hyaenodonta - Hyaenodontidae
Hyaenodon mongoliensis2 Dashzeveg 1964 eutherian
AMNH 26269