This study presents calcareous nannofossils biostratigraphy of the Campanian‒Danian interval at the Gurpi Formation in the southwest of Ilam Province, in the Zagros Basin. The studied sequence of the Gurpi Formation mainly consists of marly shale and limestones. The thickness of Gurpi Formation was measured as approximately 230 m. Forty-five species belonging to twenty-eight genera were recorde...

It has been argued that the beginning of significant pelagic calcification could have linked to Carnian Pluvial Episode (CPE), a climate change in Late Triassic (~234–232 Ma) was marked by C-cycle disruption and global warming. Nevertheless, abundant calcareous nannofossils described so far only post-CPE rocks, therefore no conclusive hypotheses can be drawn on possible causal links with it. He...

A detailed study of calcareous nannofossil assemblages from twelve uppermost lower Barremian–lower Aptian sections in the Subbetic Domain Betic Cordillera was performed. Seven new species (Crucibiscutum bastetanum, Crucibiscutum gracile, Chiastozygus lamprostauros, Cyclagelosphaera platyaspis, Lithraphidites aichmoides, pugio, and Rhagodiscus sicutclipeus) are described, one is emended (Lithrap...

Abstract Chalk has been used since Antiquity for various purposes, and Gothic preparatory layers of painted cultural heritage objects. Several materials are called chalk in Cultural Heritage, but this work especially focuses on composed calcareous nannofossils (up to 98%). These fossil remains photoautotrophic algae generally smaller than 30 μm. They mainly visible as platelets shapes under a c...

Calcareous nannofossil assemblages recovered from a long, continuous section have been described from the Sarayan region in Lut Block in east Iran. The marine Upper Cretaceous sediments of this section yield medium diverse and well-preserved calcareous nannofossil assemblages. A structural analysis of Upper Cretaceous calcareous nannofloras has revealed 30 nannofossil species. A revised zonatio...