Baiying Bologai Formation
Stratigraphic range: Early Cretaceous ~145–100 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Lithology
Primary	Conglomerate
Location
Coordinates	43°18′N 110°00′E / 43.3°N 110.0°E / 43.3; 110.0
Approximate paleocoordinates	45°12′N 110°54′E / 45.2°N 110.9°E / 45.2; 110.9
Region	Ömnögovi Province
Country	Mongolia
Baiying Bologai Formation (Mongolia)

The Baiying Bologai Formation, in other literature named Bayan Bologai Formation, is an Early Cretaceous geologic formation in the Ömnögovi Province of Mongolia.^[1] Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.^[2]

The following fossils have been reported from the formation:^[1]

• Ankylosauridae indet.^[3]
• Hadrosauridae indet.^[4]

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with indeterminate dinosaur fossils
• Alagteeg Formation

• Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2, retrieved 2019-02-21
• Coombs, W.P (1987), Asiatic Ceratopsidae might be Ankylosauridae In P. J. Currie & E. H. Koster (eds.), Fourth Symposium on Mesozoic Terrestrial Ecosystems, Tyrrell Museum of Paleontology, Drumheller, Alberta, pp. 48–51
• Gilmore, C.W (1933), "Two new dinosaurian reptiles from Mongolia with notes on some fragmentary specimens", American Museum Novitates (679): 1–20