On the Garantianinae (Ammonoidea: Stephanoceratidae) from the Upper Bajocian of the Kuban River Basin (Northern Caucasus, Russia)

Abstract

New finds of ammonites in the Upper Bajocian Garantiana garantiana Zone in the interfluve of the Kuban and Urup rivers (Karachay-Cherkessia) allow their definitions and the rank of infrazonal subdivisions to be clarified. Djanaliparkinsonia egori sp. nov. from the upper part of the Garantiana zone is described. The zone is three subzones (from bottom to top): Alanica, Subgaranti, and Egori; each subzone contains a faunal horizon of the same name. The data on systematic composition and stratigraphic distribution of species of the subfamily Garanianinae in the Upper Bajocian of the Kuban River basin are summarized, and index-species of the subzones (and faunal horizons) of the Garantiana Zone are illustrated.