Abstract The first detailed mapping and recording of nannofossils was carried out on Kei Besar Island, Southeast Maluku. This area is mostly composed the Elat Formation, which mainly by intercalated calcarenite calcareous claystone. Total 48 samples were taken three measured sections (Hollat, Ngurdu Mata Hollat). Samples prepared using smear slide method, then observed under a polarized microsc...

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...

The Upper Cretaceous deposits of northwestern Colombia accumulated in two regions with distinct tectonic settings. eastern deposits, consisting Turonian–Maastrichtian rocks from the Magdalena Valley (UMV) and Cesar-Rancheria basins, were deposited by an epicontinental sea that partially covered South American Plate. In contrast, western which comprise a series highly faulted folded Coniacian–Ma...

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...