Ejinhoro Formation

Ejinhoro Formation
Ejinhoro Formation
Stratigraphic range: Aptian-Albian; 113 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Lithology
Primary	Sandstone
Other	Mudstone, siltstone
Location
Coordinates	39°24′N 108°24′E / 39.4°N 108.4°E
Approximate paleocoordinates	40°30′N 105°30′E / 40.5°N 105.5°E
Region	Inner Mongolia
Country	China
Extent	Ordos Basin
	Ejinhoro Formation (China) Ejinhoro Formation (Inner Mongolia)

The Ejinhoro Formation (simplified Chinese: 伊金霍洛组; traditional Chinese: 伊金霍洛組; pinyin: Yījīnhuòluò Zǔ) is a geological formation in Inner Mongolia, north China, whose strata date back to the Early Cretaceous period (Aptian/Albian age.^[1]

Dinosaur remains are among the fossils that have been recovered from the formation.^[2]

Fossil content

Mammals
Taxa	Presence	Notes	Images
Genus: Hangjinia^[3] H. chowi	A single dentary^[3]	A gobiconodontid

Dinosaurs
Taxa	Presence	Notes	Images
Genus: Chiayusaurus C. sp.	Isolated teeth.	A sauropod.	Sinornithoides Wuerhosaurus
Psittacosaurus P. neimongoliensis P. ordosensis		A ceratopsian. "[One] nearly complete skeleton and other fragmentary material."^[4] "Partial cranial material."^[4]
Saurischia indeterminate		A large saurischian.
Sinornithoides S. youngi	"Near-complete articulated skeleton."^[5]	A troodontid.
Stegosauridae indeterminate	Isolated teeth.	A stegosaurid.
Wuerhosaurus W. ordosensis		A large stegosaurid. "Partial skeleton, plate, vertebra, adult."^[6]

Indeterminate pterosaur remains have also been recovered from the formation.^[7]

^ Sereno, P.C. (2010). "Taxonomy, cranial morphology, and relationships of parrot-beaked dinosaurs (Ceratopsia: Psittacosaurus)." New Perspectives on Horned Dinosaurs. Bloomington: Indiana, 21-58.
^ Weishampel, David B; et al. (2004). "Dinosaur distribution (Early Cretaceous, Asia)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 563-570. ISBN 0-520-24209-2.
^ ^a ^b Zofia Kielan-Jaworowska, Richard L. Cifelli, Zhe-Xi Luo (2004). "Chapter 12: Metatherians". Mammals from the Age of Dinosaurs: origins, evolution, and structure. New York: Columbia University Press. p. 243. ISBN 978-0-231-11918-4.{{cite book}}: CS1 maint: multiple names: authors list (link)
^ ^a ^b "Table 22.1," in Weishampel, et al. (2004). Page 479.
^ "Table 9.1," in Weishampel, et al. (2004). Page 185.
^ "Table 16.1," in Weishampel, et al. (2004). Page 345.
^ 2008 - Zitteliana - Pterosaurs