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Arkad’ev V.V. (2007) Ammonite Fauriella boissieri (Pictet), the Index Species of the Berriasian Upper Zone from the Crimean Mountains // Stratigraphy and Geological Correlation.Vol. 15, No. 2, pp. 185–192.
Ammonite Fauriella boissieri (Pictet), the index species of the Berriasian upper zone, is described for the first time as taxon occurring in the Crimean Mountains. In the Berriasian sections of the central Crimea and Chatyr-Dag massif, species F. boissieri are encountered only in association with upper Berriasian ammonites. The Berriasian–Valanginian boundary has not been identified based on ammonites in the Crimean Mountains. Consequently, there is no reason to include the otopeta Zone into the boissieri Zone in the rank of its upper subzone.