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Ammonite occurrence in the Barremian-Aptian boundary beds in North-Eastern Bulgaria.

Authors:
Kristalina Stoykova at Bulgarian Academy of Sciences, Strashimir Dimitrov Institute for Geology
Kristalina Stoykova
  • Bulgarian Academy of Sciences, Strashimir Dimitrov Institute for Geology
Marin Ivanov Ivanov at Sofia University "St. Kliment Ohridski"
Marin Ivanov Ivanov
Todor Nikolov at Bulgarian Academy of Sciences
Todor Nikolov
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Abstract

Studies are conducted on the ammonite sequences in cross-sections of the Lower Cretaceous on the basis of which two ammonite zones are separated in the Lower Aptian sediments: Procheloniceras pachystephanum and Deshayesites deshayesi. In the beds around the Barremian-Aptian boundary in a cross-section at Kacelovo village is established a rarely encountered joint development of the ammonite genera Colchidites and Procheloniceras. The precise dating of this stratigraphic level suggests that the representatives of Colchidites genus have continued their existence after this boundary in the beginning of the Aptian Age.-from Abstracts of Bulgarian Scientific Literature
1983-Ammonite occuren
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... By the beginning of the 1980s only the Deshayesites deshayesi Zone had been clearly defined (Dimitrova et al., 1961;Nikolov, 1962Nikolov, , 1969Manolov, 1962;Breskovski and Dimitrova, 1968;Dimitrova et al., 1972). New biostratigraphic data were published subsequently (Nikolov et al., 1983;Stoykova, 1986Stoykova, , 1990Ivanov, 1992Ivanov, , 1995Ivanov and Stoykova, 2001). Recently intensive investigations have been carried out on the Barremian and partially on the Aptian Stage Idakieva, 2008, 2009). ...
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