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Abstract
The genus Euthymiceras is considered as the junior synonym of the genus Neocosmoceras. Four species N. euthymi, N. cf. transfigurabilis, N. minutus sp. nov., and N. giganteus sp. nov. from the Berriasian deposits of the Crimean Mountains are described for the first time. The biostratigraphic unit formerly termed the “Euthymiceras-Neocosmoceras Beds” is ranked now as the Neocosmoceras euthymi Subzone with a synonymous index species. The subzone is correlated to the following biostratigraphic units: the synonymous subzone of the northern Caucasus, the Neocosmoceras-Septaliphoria semenovi (upper part) and Buchia volgensis local zones of Mangyshlak, the upper part of the Riasanites rjasanensis Zone in the East European platform, and the paramimounum Subzone of the boissieri Zone in the standard zonation of the Tethyan ammonites.
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