Bostobe Formation

Bostobe Formation
Stratigraphic range: Santonian-early Campanian ~85 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Underlies	Akzhar Formation
Overlies	Zhirkindek Formation
Thickness	About 45 m (148 ft)
Lithology
Primary	Sandstone
Other	Claystone
Location
Coordinates	45°54′N 64°42′E / 45.9°N 64.7°E / 45.9; 64.7
Approximate paleocoordinates	38°42′N 58°00′E / 38.7°N 58.0°E / 38.7; 58.0
Region	Qaraghandy & Qyzylorda
Country	Kazakhstan
Type section
Named for	Bostobe River
Bostobe Formation (Kazakhstan)

The Bostobe Formation (Kazakh: Boztóbe svıtasy) is a geological formation in Qaraghandy & Qyzylorda, Kazakhastan whose strata date back to the Late Cretaceous (Santonian to early Campanian stages, approximately 85 Ma).

The sandstones and claystones of the formation were deposited in estuarine, fluvial-lacustrine and fluvial-deltaic environments.

Dinosaur remains are among the fossils that have been recovered from the formation.^[1] The formation is about 45 metres (148 ft) thick and consists primarily of clay with interbeds of sand, representing an estuarine environment.^[2]