Nemegt Formation

Nemegt Formation Stratigraphic range: Late Cretaceous, 70 Ma PreЄ Є O S D C P T J K Pg N ↓
Type	Geological formation
Location
Region	Asia

The Nemegt Formation (or Nemegtskaya Svita) is a geological formation dating from the Late Cretaceous sedimentary from the Gobi Desert of Mongolia. It overlies and sometimes forms folds with the Barun Goyot Formation.^{[citation needed]} It consists of river channel sediments and contains fossils of fish, turtles, crocodilians, birds and a diverse fauna of dinosaurs. The climate associated with it was wetter than when preceding formations were deposited; there seems to have existed at least some degree of forest cover.

The absolute age of the Nemegt Formation is unknown but it is thought to be early Maastrichtian to possibly late Campanian in age, very roughly 70 million years old.^[1]

Flora and fauna of the Nemegt Formation

Coelurosaurs

Oviraptorosaurs

Oviraptorosaurs reported from the Nemegt Formation
Genus	Species	Location	Stratigraphic Position	Material	Notes	Images
Avimimus	Avimimus portentosus				Avimimids.	Avimimus Rinchenia
	Indeterminate				Avimimids.
Elmisaurus	Elmisaurus rarus			"[Three] pedes [and a] manus."[2]	A caenagnathid.
Conchoraptor	C. gracilis	Omnogov	Red Beds of Hermiin Tsav	"Partial skeleton wwith skull, [four] partial skulls, [and] numerous skull and postcranial fragments."[2]
"Ingenia"	"Ingenia" yanshini	Omnogov[2]	Red Beds of Hermiin Tsav[2]	"Partial skeleton with skull [and five] partial postcrania."[2]	An oviraptorid, also found in the Barun Goyot Formation.
Nemegtomaia	Nemegtomaia barsboldi				An oviraptorid.
Nomingia	N. gobiensis			"Partial postcranium."[3]
Rinchenia	Rinchenia mongoliensis			"Skull and fragmentary postcranium."[3]	An oviraptorid.

Paravians

Paravians reported from the Nemegt Formation
Genus	Species	Location	Stratigraphic Position	Material	Notes	Images
Adasaurus[4]	Adasaurus mongoliensis[4]			"Partial skull and fragmentary postcrania."[5]	A dromaeosaurid.	Zanabazar
Borogovia	Borogovia gracilicrus			"Partial hindlimbs."[6]	A troodontid.
Gurilynia	Gurilynia nessovi			"Shoulder girdle and forelimb elements."[7]	An enantiornithine.
Judinornis	Judinornis nogontsavensis			"Vertebra."[8]	A hesperornithine.
Saurornithoides	S. junior				Reclassified as Zanabazar junior
Teviornis	Teviornis gobiensis				An anseriform related to modern ducks and geese.
Tochisaurus	Tochisaurus nemegtensis			A metatarsus.[6]	A troodontid.
Zanabazar[9]	Zanabazar junior[4]			"Skull with fragmentary postcranial skeleton."[6]	A troodontid.

Other coelurosaurs

Misc Coelurosaurs reported from the Nemegt Formation
Genus	Species	Location	Stratigraphic Position	Material	Notes	Images
Alioramus[4]	Alioramus remotus[4]				A tyrannosaur, actually present in the Beds of Nogoon Tsav. Nemegt fossils reclassified as A. altai.	Alioramus Mononykus
	Alioramus altai				A tyrannosaur.
Anserimimus	Anserimimus planinychus			"Incomplete postcranium."[10]	An ornithomimid.
Bagaraatan	Bagaraatan ostromi			"Fragmentary skull and associated postcranium."[11]	A coelurosaur or uncertain classification.
Deinocheirus[4]	Deinocheirus mirificus[4]			"Forelimb elements."[10]	A giant ornithomimosaur.
Gallimimus[4]	Gallimimus bullatus[4]			"[Three] nearly complete skeletons, complete postcranium, skull with associated frgamentary postcranium, [and] other fragmentary postcrania."[10]	An ornithomimid.
Mononykus	Mononykus olecranus				An alvarezsaurid.
Tarbosaurus[4]	Tarbosaurus bataar[4]				A tyrannosaur. Articulated skeletons are unusually common here. May also be present in the Djadochta Formation.
Therizinosaurus[4]	Therizinosaurus cheloniformis[4]	Omnogov, Mongolia	White Beds of Hermiin Tsav	"Forelimb elements [and a] referred hindlimb."[12]	A therizinosaur.

Invertebrates

Invertebrates of the Nemegt Formation
Genus	Species	Location	Stratigraphic Position	Abundance	Notes
Nemegtia					An ostracod.

Mammals

Mammals of the Nemegt Formation
Genus	Species	Location	Stratigraphic Position	Abundance	Notes	Images
Buginbaatar	Buginbaatar transaltaiensis				A multituberculate.

Ornithischians

Ornithischians of the Nemegt Formation
Genus	Species	Location	Stratigraphic Position	Material	Notes	Images
Barsboldia	Barsboldia sicinskii			"Sacrum [and] pelvis."[13]	A hadrosaurid.	Homalocephale.
Homalocephale	Homalocephale calathoceros				A pachycephalosaur.
Prenocephale	P. prenes			"Complete skull with associated partial postcranium."[14]
Saurolophus	Saurolophus angustirostris			"At least [fifteen] specimens, including articulated skull and postcranial skeleton."[13]	A hadrosaurid.
Tarchia	Tarchia gigantea				An ankylosaur, also found in the Barun Goyot Formation.

Sauropods

Sauropods reported from the Nemegt Formation
Genus	Species	Location	Stratigraphic Position	Material	Notes	Images
Nemegtosaurus	Nemegtosaurus mongoliensis			"Skull."[15]	A titanosaur.	Nemegtosaurus
Opisthocoelicaudia	Opisthocoelicaudia skarzynskii			"Skeleton lacking skull and cervical series."[16]	A titanosaur.

References

1. ^ Sulliban, R.M. (2006). "A taxonomic review of the Pachycephalosauridae (Dinosauria: Ornithischia)." Pp. 347-366 in Lucas, S.G. and Sullivan, R.M. (eds.), Late Cretaceous vertebrates from the Western Interior. New Mexico Museum of Natural History and Science Bulletin 3.
2. ^ ^{a b c d e} "Table 8.1," in Weishampel, et al. (2004). Page 167.
3. ^ ^{a b} "Table 8.1," in Weishampel, et al. (2004). Page 166.
4. ^ ^{a b c d e f g h i j k l m} Barsbold, R. (1983). "Carnivorous dinosaurs from the Cretaceous of Mongolia [in Russian]." Trudy, Sovmestnaâ Sovetsko−Mongol’skaâ paleontologičeskaâ èkspediciâ, 19: 1–120.
5. ^ "Table 10.1," in Weishampel, et al. (2004). Page 198.
6. ^ ^{a b c} "Table 9.1," in Weishampel, et al. (2004). Page 185.
7. ^ "Table 11.1," in Weishampel, et al. (2004). Page 213.
8. ^ "Table 11.1," in Weishampel, et al. (2004). Page 215.
9. ^ Norell, M.A.; Makovicky, P.J., Bever, G.S., Balanoff, A.M., Clark, J.M., Barsbold, R. and Rowe, T. (2009). "A Review of the Mongolian Cretaceous Dinosaur Saurornithoides (Troodontidae: Theropoda)". American Museum Novitates 3654: 63. 
10. ^ ^{a b c} "Table 6.1," in Weishampel, et al. (2004). Page 138.
11. ^ "Table 5.1," in Weishampel, et al. (2004). Page 112.
12. ^ "Table 7.1," in Weishampel, et al. (2004). Page 152.
13. ^ ^{a b} "Table 20.1," in Weishampel, et al. (2004). Page 441.
14. ^ "Table 21.1," in Weishampel, et al. (2004). Page 465.
15. ^ "Table 13.1," in Weishampel, et al. (2004). Page 263.
16. ^ "Table 13.1," in Weishampel, et al. (2004). Page 270.

See also

	Earth sciences portal
	Paleontology portal
	Dinosaurs portal

• Barun Goyot Formation
• Djadochta Formation
• List of fossil sites
• Nemegt Basin
• List of dinosaur-bearing rock formations