Javkhlant Formation

The Javkhlant Formation is a geological formation in Mongolia whose strata date back to the Late Cretaceous possibly Santonian to Campanian. Ceratopsian, ornithopod and theropod remains been found in the formation. A prominent fossilized therizinosauroid nesting site is also known from the formation.

Javkhlant Formation Stratigraphic range: Santonian-Campanian ~85 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Overlies	Bayan Shireh Formation
Thickness	380 m (1,250 ft)
Lithology
Primary	Mudstone
Other	Sandstone, conglomerate
Location
Coordinates	44.4°N 109.4°E
Approximate paleocoordinates	44.6°N 98.8°E
Region	Dornogov
Country	Mongolia
Type section
Named by	Khand et al.
Year defined	2000
Javkhlant Formation (Mongolia)

Paleobiota of the Javkhlant Formation

Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon		Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Dinosaurs

Genus	Species	Location	Stratigraphic Position	Material	Notes	Images
Albinykus	A. baatar	Khugenetslavkant		"Partial hindlimbs and pelvic girdle."[1]	An alvarezsaurid.
Haya	H. griva	Khugenetslavkant		"Skull with partial skeleton of multiple specimens."[2]	A primitive ornithopod.
Therizinosauroidea indet.	Indeterminate			"Large nesting site composed by more than 10 egg clutches in several nests."[3][4]	A nesting area laid by a colony of therizinosauroids.
Neoceratopsia indet.	Indeterminate	Khugenetslavkant		"Embryonic remains enclosed within an isolated egg."[5]	A neoceratopsian.
Yamaceratops	Y. dorngobiensis	Khugenetslavkant, Shine Us Khuduk	Shine Us Khuduk red beds	"Skull with partial skeletons."[6]	A neoceratopsian.

See also

• List of dinosaur-bearing rock formations

References

1. Nesbitt, Sterling J.; Clarke, Julia A.; Turner, Alan H.; Norell, Mark A. (2011). "A small alvarezsaurid from the eastern Gobi Desert offers insight into evolutionary patterns in the Alvarezsauroidea". Journal of Vertebrate Paleontology. 31 (1): 144–153. doi:10.1080/02724634.2011.540053.
2. Makovicky, Peter J.; Brandon M. Kilbourne; Rudyard W. Sadleir; Mark A. Norell (2011). "A new basal ornithopod (Dinosauria, Ornithischia) from the Late Cretaceous of Mongolia". Journal of Vertebrate Paleontology. 31 (3): 626–640. doi:10.1080/02724634.2011.557114.
3. Kobayashi, Y.; Lee, Y.; Barsbold, R.; Zelenitsky, D.; Tanaka, K. (2013). "First record of a dinosaur nesting colony from Mongolia reveals nesting behavior of therizinosauroids". In Maxwell, E.; Miller-Camp, J.; Anemone, R. (eds.). 73rd Annual Meeting of Society of Vertebrate Paleontology. Los Angeles. p. 155.
4. Tanaka, K.; Kobayashi, Y.; Zelenitsky, D. K.; Therrien, F.; Lee, Y.-N.; Barsbold, R.; Kubota, K.; Lee, H.-J.; Tsogtbaatar, C.; Idersaikhan, D. (2019). "Exceptional preservation of a Late Cretaceous dinosaur nesting site from Mongolia reveals colonial nesting behavior in a non-avian theropod". Geology. 47 (9): 843−847. doi:10.1130/G46328.1.
5. Balanoff, A. M.; Norell, M. A.; Grellet-Tinner, G.; Lewin, M. R. (2008). "Digital preparation of a probable neoceratopsian preserved within an egg, with comments on microstructural anatomy of ornithischian eggshells" (PDF). Naturwissenschaften. 95 (6): 493−500. Bibcode:2008NW.....95..493B. doi:10.1007/s00114-008-0347-2. PMID 18347769.
6. Eberth, D.A.; Kobayashi, Y.; Lee, Y.N.; Mateus, O.; Therrien, F.; Zelenitsky, D.K.; Norrell, M.A. (2009). "Assignment of Yamaceratops dorngobiensis and associated redbeds at Shine Us Khudag (eastern Gobi, Dorngobi Province, Mongolia) to the redescribed Javkhlant Formation (Upper Cretaceous)". Journal of Vertebrate Paleontology. 29 (1): 295–302. doi:10.1080/02724634.2009.10010384