Bayan Shireh Formation

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Bayan Shireh Formation
Stratigraphic range: Albian-Santonian ~102–86 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Sub-units	Upper beds, lower beds
Underlies	Javkhlant Formation
Overlies	Baruunbayan Formation
Thickness	Up to 300 m (980 ft)
Lithology
Primary	Claystone, sandstone
Other	Conglomerate, mudstone
Location
Coordinates	44°18′N 109°12′E / 44.3°N 109.2°E / 44.3; 109.2
Approximate paleocoordinates	46°30′N 100°00′E / 46.5°N 100.0°E / 46.5; 100.0
Region	Gobi Desert
Country	Mongolia
Type section
Named for	Bayan Shireh
Named by	Vasiliev et al.
Year defined	1959
Fossil localities in Mongolia. From C to D, mainly Bayan Shireh locations

The Bayan Shireh Formation (also known as Baynshiree/Baynshire, Baynshirenskaya Svita or Baysheen Shireh) is a geological formation in Mongolia, that dates to the Cretaceous period. It was first described and established by Vasiliev et al. 1959.^[1]