Dzunbain Formation

The Dzunbain Formation (also known as Dzunbayn Formation) is a geological formation in Mongolia, dating to the Early Cretaceous (Aptian-Albian).^[1] The formation contains fossils of mammals, reptiles, turtles and dinosaurs. The Dzunbain Formation is equivalent to the Khuren Dukh Formation.^[2]

Dzunbain Formation
Stratigraphic range: Aptian–Albian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Sub-units	Chamrin-Us Member Khovboor Member
Thickness	up to 60 metres (200 ft) at Chamrin-Us
Lithology
Primary	Claystone and sandstone
Location
Coordinates	42.45°N 102.417°E / 42.45; 102.417
Region	Erdene District, Dornogovi Province, Mongolia
Country	Mongolia

Paleobiota of the Dzunbain Formation

Amphibians

Genus	Species	Location	Stratigraphic position	Material	Notes	Image
Eodiscoglossus[3]	E. sp.[3]	Khovboor

Squamates

Genus	Species	Location	Stratigraphic position	Material	Notes	Image
Dorsetisaurus[4]	D. sp.[4]	Khovboor
Hoburogekko[5]	H. suchanovi[5]	Khovboor		"A partial skull."[5]
Hodzhakulia[4]	H. sp.[4]	Khovboor
Iguania[4]	Indeterminate[4]	Khovboor
Lacertilia[4]	Indeterminate[4]	Khovboor
Paramacellodidae[4]	Indeterminate[4]	Khovboor
Priscagamidae[4]	Indeterminate[4]	Khovboor
Slavoia[4]	S. sp.[4]	Khovboor
Xantusiidae[4]	Indeterminate[4]	Khovboor
Xenosauridae[4]	Indeterminate[4]	Khovboor

Mammals

Genus	Species	Location	Stratigraphic position	Material	Notes	Image
Arginbaatar[6]	A. dimitrievae[6]	Khovboor
Arguimus[7]	A. khosbajari[7]	Khovboor
Eobaatar[8]	E. magnus and E. minor[8]	Khovboor		"Lower jaw fragment (E. magnus)."[8]
Gobiconodon[9]	G. borissiaki and G. hobuvensis[9]	Khovboor		"Both species known only from cranial remains."[9]
Gobiotheriodon[10]	G. infinitus[10]	Khovboor			Previously known as "Gobiodon".[10]
Heptoconodon	Indeterminate	Khovboor
Hovurlestes[11]	H. noyon[11]	Khovboor
Kielantherium[12]	K. gobiensis[12]	Khovboor
Monobaatar[8]	M. mimicus[8]	Khovboor
Prokennolestes[13]	P. minor, P. sp. and P. trofimovi[13]	Khovboor
Plagiaulacidae[8]	Indeterminate[8]	Khovboor

Turtles

Genus	Species	Location	Stratigraphic position	Material	Notes	Image
Hangaiemys[14]	H. hoburensis[14]	Khovboor
Mongolemys[14]	M. sp.[14]	Khovboor

Dinosaurs

Genus	Species	Location	Stratigraphic position	Material	Notes	Image
Mongolostegus[15]	M. exspectabilis[15]	Chamrin-Us		"Posterior dorsal and anterior caudal vertebrae as well as pelvic material."[15]	Previously known as Wuerhosaurus mongoliensis.[16] One of the last surviving stegosaurs.[15]
Psittacosauridae[17]	Indeterminate[17]	Chamrin-Us
Psittacosaurus[18]	P. mongoliensis[18]	Khovboor
Sauropoda	Indeterminate	Chamrin-Us and Khovboor
Shamosaurus[2]	S. scutatus[2]	Chamrin-Us and Khovboor		"A complete skull, lower jaws and partial postcranial skeleton with armor. Also referred are a skull piece, lower jaw and two cervical halfrings."[19]
Stegosauridae[15]	Indeterminate[15]	Chamrin-Us			One of the last surviving stegosaurs.[15]
Troodontidae[20]	Indeterminate[20]	Chamrin-Us

See also

• List of dinosaur-bearing rock formations