Dicoelitid belemnites from the Caucasian margin of the Tethys: new data from the Upper Bajocian-Lower Bathonian of Karachay-Cherkessia, southwest Russia


Authors: Dzyuba OS, Mitta VV, Sherstyukov MP

Published in: Bulletin of Geosciences, volume 94, issue 4; pages: 409 - 424; Received 14 May 2019; Accepted in revised form 8 September 2019; Online 10 December 2019

Keywords: Dicoelitidae, Middle Jurassic, Bajocian, Bathonian, Northern Caucasus, western Tethys, palaeobiogeography,

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Early representatives of the belemnite family Dicoelitidae (Belemnopseina) from the Northern Caucasus are reported from the Upper Member of the Djangura Formation of Karachay-Cherkessia. We document the first records of Dicoelites (s. str.) from the Upper Bajocian of Eastern Europe and introduce the new species Dicoelites aprilis Dzyuba sp. nov. and Dicoelites octobris Dzyuba sp. nov. Additionally, Conodicoelites sp. from the Upper Bajocian as well as a new record of Conodicoelites exiguus (Krimholz, 1953) from the Lower Bathonian are described. New belemnite records from Karachay-Cherkessia indicate the successive appearance of dicoelitid genera in the Caucasian margin of the Tethys during the Late Bajocian, i.e. Dicoelites in the late Niortense Chron and Conodicoelites in the early Garantiana Chron. Our data provide evidence supporting the presence of Dicoelites in the Bajocian deposits of the western Tethyan domain that was previously considered doubtful.


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