Олигоцен-миоценовая стратиграфия и палеонтология Б

De Bonis, L., Brunet M., Kordikova E.G. & Mavrin, A,V. 1997. Oligocene-Miocene sequence stratigraphy and vertebrate paleontology of western and southern Betpakdala Steppe, South Kazakhstan. – In: J.-P.Aguilar, S.Legendre, J.Michaux (Eds.): Actes du Congres Biochrom'97, Montpellier, 14-17 Avril, 1997, pp. 225-240.

 

ABSTRACT
Three distinctive but inadequately represented Oligocene-Miocene faunas were yielded in Betpakdala Steppe, South Kazakhstan, in 1995.

Fossil vertebrates were recovered from the Oligocene (Betpakdala Formation) and the Upper Oligocene - Lower Miocene (Askazansor Fm.) strata of Betpakdala region.
Findings of vertebrates from Betpakdala Fm. are represented by Pisces indet., Rhinocerotoidea indet. and Indricotherium sp.
The Askazansor Fm. contains two different faunas which were earlier united and considered together. One of them, from the lower part of the Askazansor Fm., on the left bank of the Baktykarin River, includes Pisces indet., Ocadia cf. turgaica Kus. & CKHIK., Chrysemys cf. lavrovi Kus. & CKHIK. , Emydidae indet., Ulutrionyx cf. turgaicus Kus. et CKHIK. , Testudinidae indet.,
Rodentia indet., Chalicotheriidae indet., Schizotherium cf. turgaicum, Rhinocerotoidea indet., Paraceraherium sp. and Tragulidae indet.

New findings of chalicotherids, rhinocerotids and turtles and comparison with the known materials provide an evidence of a late Oligocene age.
South of the Askazansor Sait Lake, a rich bone concentration from the upper part of the Askazansor Fm., has produced Melanochelys betpakdalensis (KHOZ.), Borissiakia betpakdalensis (BOR.) (providing most part of the findings) Aceratherini indet., Diaceratherium sp., Protaceratherium betpakdalensis (BOR.), Rhinocerotoidea indet., Cervoidea indet., Brachyodus n.
sp., Anthracotheriidae indet. as well as Ysengrinia sp. Based on findings of amphicyonid, chalicotherid, rhinocerotids, cervids, the age of the upper part of the Askazansor Fm. (Askazansor loc.) appears to be Lower Mioc;ne and corresponds to MN 1-2 of the European zonation.

Key-Words: Oligocene, Miocene, Central Asia, Kazakhstan, Vertebrata