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Arkadev V.V., Fedorova A.A., Saveleva Yu.N., Tesakova E.M. (2006) Biostratigraphy of JurassicCretaceous Boundary Sediments in the Eastern Crimea // Stratigraphy and Geological Correlation. Vol. 14, No. 3, pp. 302330.

The Dvuyakornaya Formation section in the eastern Crimea is described and subdivided into biostratigraphic units based on ammonites, foraminifers, and ostracodes. The lower part of the formation contains first discovered ammonites of the upper Kimmeridgian (Lingulaticears cf. procurvum (Ziegler), Pseudowaagenia gemmellariana Olóriz, Euvirgalithacoceras cf. tantalus (Herbich), Subplanites sp.) and Tithonian (?( Lingulaticeras efimovi (Rogov), Phylloceras consaguineum Gemmellaro, Oloriziceras cf. schneidi Tavera, and Paraulacosphinctes cf. transitorius (Oppel)). Based on the assemblage of characteristic ammonite species, the upper part of the formation is attributed to the Berriasian jacobi Zone. Five biostratigraphic units (zones and beds with fauna) distinguished based on foraminifers are the Epistomina ventriosaMelathrokerion eospirialis Beds and Anchispirocyclina lusitanicaMelathrokerion spirialis Zone in the upper KimmeridgianTithonian, the Protopeneroplis ultragranulatus Siphoninella antiqua, Frondicularia cuspidiataSaracenaria inflanta zones, and Textularia crimica Beds in the Berriasian. The Cyrherelloidea tortuosaPalaeocytheridea grossi Beds of the Upper Jurassic and Raymoorea peculiarisEucytherura ardescaeProtocythere revile Beds of the Berriasian are defined based on ostracodes. A new biostratigraphic scale is proposed for the upper Kimmeridgian Berriasian of the eastern Crimea. The Dvyyakornaya Formation sediments are considered as deepwater facies accumulated on the continental slope.



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