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An Early Miocene biserial foraminiferal event in the Transylvanian Basin (Romania)

Domenii publicaţii > Ştiinţele pământului şi planetare + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: BELDEAN, C.; FILIPESCU, S.; BALC, R.

Editorial: Geologica Carpathica, 61 (3), p.227-234, 2010.

Rezumat:

Investigations of the Lower Miocene of the Transylvanian Basin reveal particular high abundances (>90%) of small sized biserial foraminifera. This biotic event has not been noticed in the Transylvanian Basin so far probably owing to the facies misinterpretation and the small size of specimens. SEM investigations allow more precise identification of biserial planktonic taxa and more accurate taxonomic interpretations. The high abundance of Bolivina/Streptochilus assemblages provide evidence for paleogeographic connections to the Indo-Pacific area and support new paleoenvironmental interpretations at the transition from the Early to Mid Miocene.
Both planktonic foraminifera and calcareous nannoplankton suggest a late Burdigalian age. A new Bolivina/Streptochilus acme biozone is proposed.

Cuvinte cheie: foraminifera, Miocene, Transylvania, Streptochilus, Bolivina