Lower Tournaisian (Lower Carboniferous) Microfauna of the Volga–Ural Basin (Russia)

Авторы: Afanasieva M.S., Kononova L.I., Zaytseva E.L., Branova A.V.
Журнал: Paleontological Journal
Том: 57
Номер: Suppl. 1
Год издания: 2023
Издательство: Pleiades Publishing, Inc.
Местоположение издательства: New York, USA
Первая страница: 1
Последняя страница: 30
Аннотация: ZolotoozerskayaFormation of the Melekesskaya-1 Borehole, in the Volga-Ural Basin are studied. Five lithological unitswere recognized, and the deposits were described bed-by-bed. Three biostratigraphic units with conodontswere recognized: the Beds with Siphonodella sulcata, Beds with Siphonodella duplicata and Beds with Siphonodellaobsoleta–“Dinodus” sp., tentatively correlated with the Siphonodella sulcata, Siphonodella duplicata,and Siphonodella belkai conodont zones. Two foraminiferal assemblages were identified and correlated withthe Tournayellina pseudobeata–remnant Quasiendothyra and Earlandia minima zones. Two successive ecozonesof radiolarians are established: Provisocyntra kononovae and Spongentactinia oraia. For the first time,two transgressive second order cyclites have been identified in the sediments of the Zolotoozerskaya Formation.Lithology and inversion of the dominant radiolarian morphotypes suggest an environmental change:from relatively deeper-water to shallower-water habitats.
Добавил в систему: Зайцева Елена Леонидовна

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