Karabastau Formation

The Karabastau Formation is a geological formation in Kazakhstan whose strata date back to the Late Jurassic. Pterosaur remains are among the fossils that have been recovered from the formation.

Lithology and depositional environment

The primary lithology consists of 1 mm thick varve laminations of claystone, with a dark part and a light dolomitic part, which probably correspond to a wet and dry season respectively. These were deposited within an ancient freshwater paleolake, that given the number of laminations has been suggested to have existed for over 150,000 years. The formation is noted for its exceptional preservation of fossils, exemplified by the preserved pycnofibres of Sordes.

Paleofauna

Vertebrates

Genus	Species	County	Member	Abundance	Notes	Images
Batrachognathus	B. volans			2 specimens	An Anurognathid Pterosaur.
Karatausuchus	K. sharovi				An Atoposaurid Crocodylomorph.
Karaurus	K. sharovi				One of the earliest salamanders.
Praeornis	P. sharovi			2 specimens	Proto-Feather
Sharovisaurus	S. karatauensis				A Paramacellodid lizard
Sordes	S. pilosus			8 specimens	A Pterodactylomorph Pterosaur.
Yaxartemys	Y. longicauda				Turtle
Palaeonisciformes	2 species			346 specimens	2 distinct taxa
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Invertebrates

Numerous species of insect are known from several localities within the formation, primarily Karatau-Mikhailovka an extremely partial list is given here

Genus	Species	County	Member	Abundance	Notes	Images
Archocyrtus	A. gibbosus, A. kovalevi				An Acrocerid fly
Aulieezidium	A. karatauense				A Fulgoromorph
Auliepterix	A. mirabilis				A Micropterygid moth.
Omma	O. aberatum, O. jurassicum, O. pilosum				Ommatid beetles
Mesogyrus	M. antiquus				Gyrinid beetle
Palaeolepidopterix	P. aurea				A Micropterygid or Eolepidopterigid moth.
Pseudopolycentropus	P. latipennis				Basal Mecopteran
Stenophlebia	S. karatavica				Stem-Dragonfly
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