Bostobe Formation

The Bostobe Formation (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. The formation is about 45 m thick and consists primarily of clay with interbeds of sand, representing an estuarine environment.

Fossil content
Khunnuchelys lophorhothon, a trionychid turtle recovered from the formation, was initially thought to belong to a hadrosaurid dinosaur and classified as cf. Lophorhothon sp.


 * Mammals
 * Beleutinus orlovi
 * Zhalmouzia bazhanovi
 * Parazhelestes sp.


 * Ankylosaurs
 * Ankylosauridae indet.
 * Ornithopods
 * Aralosaurus tuberiferus
 * Arstanosaurus akkurganensis
 * Batyrosaurus rozhdestvenskyi


 * Sauropods
 * Titanosauridae indet.
 * Sauropoda indet.


 * Theropods
 * Caenagnathidae indet.
 * Troodontidae indet.
 * Therizinosauria indet.
 * Ornithomimidae indet.
 * Tyrannosauroidea indet.


 * Pterosaurs
 * Aralazhdarcho bostobensis
 * Samrukia nessovi


 * Turtles
 * Adocus foveatus
 * Anatolemys maximus
 * Khunnuchelys lophorhothon
 * Lindholmemys gravis
 * Shachemys baibolatica
 * Trionyx kansaiensis, T. onomatoplokos, T. riabinini


 * Other reptiles
 * Bishara backa


 * Amphibians
 * Anura indet.
 * Eoscapherpeton
 * Fish
 * Gobiates sp.


 * Flora
 * Ulmaceae indet.