Biostratigraphy of the Upper Jurassic – lowermost Cretaceous succession at Veliky Kamenets (Pieniny Klippen Belt, Carpathians, SW Ukraine)

• Autorzy: Rehakova D. , Krobicki M. , Matyja B. , Wierzbowski A.
• Konferencja: International Congress on the Jurassic System (7 ; 06-18.09.2006 ; Kraków, Poland]
• Języki publikacji: EN

Abstrakty

EN

The Veliky Kamenets quarry is an essential locality in stratigraphical and palaeomagnetical studies of the Jurassic and lowermost Cretaceous in eastern part of the Pieniny Klippen Belt. The carbonate succession, about 40 m thick, has been subdivided into 6 major lithostratigraphical units (A, B, C, D, DE and E) which biostratigraphy was based mainly on the ammonite fauna (Lewandowski et al. 2005); these deposits are overlain by about 13 m thick complex unit of carbonates (fossiliferous limestones and calcareous sedimentary breccias composed mainly of micritic limestone clasts) alternating with volcanogenic rocks (basalt lava flows, and pyroclastic deposits). The studied succession yielded abundant and well preserved microfossils which enable detailed stratigraphical interpretation of the deposits in question. The lowest part of the Upper Jurassic succession (upper part of unit B) is represented by lower Ammonitico Rosso limestones rich in planktonic foraminifers Globuligerina. The ammonites are indicative of the Plicatilis Zone and Transversarium/or Bifurcatus Zone of Middle, and possibly lowermost Upper Oxfordian, whereas calcareous dinoflagellates found at the top of the unit indicate the Parvula Zone of the Upper Oxfordian. The overlying cherty limestones (unit C) yielded the Kimmeridgian ammonites found in their uppermost part; the deposits of the unit are rich in rests of planktonic crinoids Saccocoma. The younger ammonite assemblage coming from the lower part of the upper Ammonitico Rosso unit (unit D) is indicative of the Acanthicum Zone of the Upper Kimmeridgian. These deposits are characterized by Saccocoma-Globochaete microfacies, and yielded calcareous dinocysts indicative of the Moluccana Zone of the Kimmeridgian. The Kimmeridgian/Tithonian boundary runs in the middle of the discussed Ammonitico Rosso unit (unit D) as evidenced by occurrence of calcareous dinocyst Carpistomiosphaera tithonica. The upper part of the unit yielded calpionellids and calcareous dinocysts indicative of the Praetintinnopsella Zone located at the turn of the Middle and Upper Tithonian. The topmost part of the unit, as well as the lower part of overlying partly nodular micritic limestones (unit E/D) yielded already calpionellids and calcareous dinocysts indicative of the Crassicolaria Zone of the Upper Tithonian. The deposits are dominated by the Crassicolaria-Globochaete microfacies. The Jurassic/Cretacous boundary runs in the middle of the partly nodular micritic limestone unit (D/E). Here appears assemblage dominated by spherical forms of Calpionella alpina indicating the lowermost part of the Calpionella Zone of the Lower Berriasian. This zone ranges up at least to the upper part of massive micritic limestones (unit E) where the calpionellids of the Ferasini Subzone have been recognized. The microfacies of the Globochaete-Calpionella type, locally enriched in radiolarians prevail. The carbonates of the topmost part of the succession covering the basalt lava flows, as well as limestones alternating with pyroclastic layers yielded calpionellids of the Calpionellopsis Zone of the Upper Berriasian indicating both the Simplex Subzone, and the Oblonga Subzone. The breccias contain i.a. the clasts of the Upper Tithonian micritic limestones with calpionellids of the Crassicolaria Zone and of volcanic rocks. The carbonates correspond to the ?ysa Limestone Fm., including the Walentowa Breccia Member of this formation (see Birkenmajer 1977).

Słowa kluczowe

EN

Pieniny Klippen Belt; SW Ukraine; Upper Jurassic; Berriasian; biostratigraphy; calpionellids; calcareous dinocysts; microfacies

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Volumina Jurassica
• Rocznik: 2006
• Tom: Vol. 4, no. 1
• Strony: 207--208
• Opis fizyczny: Bibliogr. 2 poz.

Twórcy

autor

Rehakova D.

autor

Krobicki M.

autor

Matyja B.

autor

Wierzbowski A.

• 1Department of Geology and Paleontology, Faculty of Natural Sciences, Comenius University, Mlynska Dolina – G1, 84-215 Bratislava, Slovakia,

Bibliografia

• 1. Birkenmajer K. 1977. Jurassic and Cretaceous lithostratigraphic units of the Pieniny Klippen Belt, Carpathians, Poland. Studia Geologica Polonica, 45: 1-158.
• 2. Lewandowski M., Krobicki M., Matyja B. A. and Wierzbowski A. 2005. Palaeogeographic evolution of the Pieniny Klippen Basin using stratigraphic and palaeomagnetic data from the Veliky Kamenets section (Carpathians, Ukraine). Palaeogeography, Palaeoclimatology, Palaeocology, 216: 53-72.