Uppermost Berriasian macro- and microfossil assemblages from the Ticha Formation of the Eastern Fore-Balkan Mts (Bulgaria)

Pages: 
pp. 19-37
Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
Abstract: 

Late Berriasian macro- and microfossil assemblages from the Ticha Formation (Eastern Fore-Balkan Mts, Bulgaria) were studied. Eight ammonite taxa, including coiled and straight forms, were described. In addition, 23 calpionellid, 12 calcareous dinocyst and 4 foraminiferal taxa were identified. The “Thurmannicerasotopeta ammonite Subzone of the Tirnovella alpillensis Zone, the calpionellid Oblonga Subzone of the Calpionellopsis Zone and the Stomiosphaera wanneri calcareous dinocyst Zone were indicated. The advent of Bochianites neocomiensis, the late occurrence of Bochianites (?) ambiguus and the earliest appearance of Phylloceras (Hypophylloceras) tethys tethys was documented in the Eastern Fore-Balkan Mts area. The calpionellid-spicule microfacies was also recognized. The fossil data allow a correlation with similar coeval localities of the European Tethyan Realm. Pelagic macro- and microfossils and the microfacies are indicative of deeper-water basin depositional settings.

Keywords: 

ammonites, microfossils, Bochianites, uppermost Berriasian, Eastern Fore-Balkan Mts, Bulgaria

VOLUME 49 (3)/December 2020

Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Department of Geology, Palaeontology and Fossil Fuels, Sofia University “St Kliment Ohridski”, 15 Tsar Osvoboditel Blvd, 1504 Sofia, Bulgaria
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Department of Geology, Palaeontology and Fossil Fuels, Sofia University “St Kliment Ohridski”, 15 Tsar Osvoboditel Blvd, 1504 Sofia, Bulgaria
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Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Block 24, 1113 Sofia, Bulgaria
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Department of Geology, Palaeontology and Fossil Fuels, Sofia University “St Kliment Ohridski”, 15 Tsar Osvoboditel Blvd, 1504 Sofia, Bulgaria

Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 24, 1113 Sofia, Bulgaria

Geological Institute, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Block 24, 1113 Sofia, Bulgaria