Abstract—
The radiolarians from the Campanian–Maastrichtian deposits of the Vaamychgyn unit sequence (Yakenmyveem River, Koryak Upland, Ekonai terrane) were studied for the first time. On the basis of the joint occurrence of Excentrosphaerella vivenkensis (Lipman), Lithomespilus mendosa (Krasheninnikov), and Stichomitra livermorensis Campbell et Clark, the studied complex is attributed to the Campanian–Maastrichtian. The assemblage contains abundant representatives of the family Heliodiscidae Haeckel, which are widely common in the Boreal and Austral realms and can be of high importance for the stratigraphic and paleobiogeographic paleoreconstructions. The new data allow one to establish the time of the first occurrence of Excentrosphaerella teuria (Hollis), which was previously known only from the Early Paleocene. The species Cromyosphaera vivenkensis Lipman is attributed in this work to the genus Excentrosphaerella Dumitrica.
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ACKNOWLEDGMENTS
We are grateful to K.A. Krylov (Stanford University, USA) for providing us with samples and their geological references, N.V. Gorkova (GIN RAS) for her help in taking images with a scanning electron microscope, and M.S. Afanasieva and T.N. Palechek for valuable advice and remarks.
This work was performed in accordance with the research plans of GIN RAS (Bragin N.Yu., research project no. 0135-2018-0033).
This work was supported in part by the Russian Foundation for Basic Research (project nos. 15-05-04700 (the chemical preparation of samples and the SEM study of radiolarians), 16-05-00363 and 18-05-00494 (morphological and taxonomic studies)).
Reviewers M.S. Afanasieva and T.N. Palechek
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Bragina, L.G., Bragin, N.Y. Radiolarians of Family Heliodiscidae Haeckel, 1981 in the Upper Cretaceous (Campanian–Maastrichtian) Siliceous Deposits of the Vaamychgyn Unit of the Koryak Upland. Stratigr. Geol. Correl. 27, 248–258 (2019). https://doi.org/10.1134/S0869593819020011
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DOI: https://doi.org/10.1134/S0869593819020011