Abstract
This paper presents the results of the study of the Upper Bajocian Garantiana garantiana Zone (Middle Jurassic) and characteristic ammonites in sections of the basin of the Kuban River (Karachay-Cherkessia). The assemblage contains species of the genera Garantiana, Pseudogarantiana, Paragarantiana, Djanaliparkinsonia (all family Stephanoceratidae) and Vermisphinctes (family Perisphinctidae). A section of the Garantiana Zone on the Kyafar River contains (from bottom to top) Beds with Djanaliparkinsonia alanica (also recognized on the Kuban River), Beds with Garantiana subgaranti and Beds with Paragarantiana, approximately corresponding to the Dichotoma, Garantiana, and Tetragona subzones of the standard scale. Garantiana subgaranti Wetzel and Vermisphinctes martiusii (d’Orbigny) are described. Prorsisphinctes Buckman, 1921 is proposed as a junior subjective synonym of Vermisphinctes Buckman, 1920.
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Notes
The hypothesis of N.V. Besnosov (Besnosov and Mitta, 1993) of the occurrence of a Northern Caucasian species of Pseudogarantiana in the Subfurcatum [=Niortense] Subzone, was apparently erroneous, resulting from exceptional rarity of their findings in sections, without association with stratigraphically important taxa.
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ACKNOWLEDGMENTS
In the fruitful part of the field work on the study of the Garantiana garantiana Zone, I was joined by my friends and colleagues V.V. Kostyleva (Geological Institute of the Russian Academy of Science, Moscow), I.A. Starodubtseva (Vernadsky State Geological Museum of the Russian Academy of Science, Moscow), and the paleontology enthusiasts M.P. Sherstyukov (Stavropol), O.V. Trofimov (Rostov-on-Don), O. Nagel (Radeberg, Germany), and S. Gräbenstein (Bodelshausen, Germany). S.V. Bagirov (Paleontological Institute of the Russian Academy of Sciences) took the photographs of the ammonites. I am grateful to everyone who contributed to the collection of the material and the preparation of this work.
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Mitta, V.V. Ammonites and Stratigraphy of the Upper Bajocian Garantianagarantiana Zone in the Interfluve between the Kuban and Urup Rivers (Northern Caucasus). Paleontol. J. 53, 1188–1202 (2019). https://doi.org/10.1134/S0031030119110066
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DOI: https://doi.org/10.1134/S0031030119110066