Alagteeg Formation

Alagteeg Formation Stratigraphic range: Santonian-Campanian ~85–72 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Underlies	Djadochta Formation
Thickness	~16 m (52 ft) at the Bayan Zag locality
Lithology
Primary	Sandstone, mudstone
Location
Coordinates	44°18′N 103°18′E / 44.3°N 103.3°E / 44.3; 103.3Coordinates: 44°18′N 103°18′E / 44.3°N 103.3°E / 44.3; 103.3
Approximate paleocoordinates	41°54′N 92°24′E / 41.9°N 92.4°E / 41.9; 92.4
Region	Ömnögovi Province
Country	Mongolia
Extent
Type section
Named for	Alag Teeg
Named by	Hasegawa et al.
Year defined	2009
Thickness at type section	~15 m (49 ft)
Alagteeg Formation (Mongolia)

The Alagteeg Formation is a geological formation in Mongolia whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation.^[1] It predominantly consists of alternating reddish brown mudstone and horizontally laminated sandstone, with ripple cross laminations and rhizoliths. It was first formally defined as a unit by Hasegawa et al in 2008 as a distinct unit from the overlying Djadochta Formation. The environment of deposition is suggested to be fluvial, originating in sandy braided river, floodplain and ephemeral lake depositional environments, as opposed to the desert depositional environment of the Djadochta Formation.^[2]

Vertebrate Paleofauna[]

• Abdarainurus^[3]
• Pinacosaurus^[1]
• Plesiohadros
• Protoceratops^[1]
• Trionychidae indet.

Hypothetical reconstruction/size comparison of Abdarainurus, a dinosaur from the Alagteeg Formation.

See also[]

• List of dinosaur-bearing rock formations

References[]

Bibliography[]

• Averianov, Alexander O., and Alexey V. Lopatin. 2020. An unusual new sauropod dinosaur from the Late Cretaceous of Mongolia. Journal of Systematic Palaeontology .. .. doi:10.1080/14772019.2020.1716402
• Hasegawa, Hitoshi; Ryuji Tada; Niiden Ichinnorov, and Chuluun Minjin. 2009. Lithostratigraphy and depositional environments of the Upper Cretaceous Djadokhta Formation, Ulan Nuur basin, southern Mongolia, and its paleoclimatic implication. 35. 13–26. doi:10.1016/j.jseaes.2008.11.010
• Weishampel, David B.; Peter Dodson, and Halszka Osmólska (eds.). 2004. The Dinosauria, 2nd edition, 1–880. Berkeley: University of California Press. Accessed 2019-02-21. ISBN 0-520-24209-2