Nannofossil Distribution and Age of Kendeng Zone In Kalibeng River Section of Kedungringin, Plandaan Area, Jombang, East Java

Choiriah, Siti Umiyatun and Prasetyadi, Carolus and Yudiantoro, Dwi Fitri and Kapid, Rubiyanto (2020) Nannofossil Distribution and Age of Kendeng Zone In Kalibeng River Section of Kedungringin, Plandaan Area, Jombang, East Java. Indonesian Journal on Geoscience (IJOG), 7 (1). pp. 15-24. ISSN 23559306, 23559314

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Abstract

This study was carried out at Kalibeng River Section, in Kedungringin area, a site with lithology suitable for a nannoplankton research. Methods used in this research include performing a stratigraphical measurement section at the field, collecting thirty-two samples, and preparing the samples with the smear slide method using a polarizing microscope with 1000x magnification, and preparing several rock samples using SEM analysis. The analysis of nannofossil resulted in twelve genera and forty-three species. The identified genera are: Calcidiscus, Coccolithus, Ceratolithus, Discoaster, Gephyrocapsa, Helicosphaera, Pseudoemiliania, Reticulofenestra, Rhabdosphaera, Sphe- nolithus, Syracosphaera, and Umbilicosphaera. The presence of these genera indicates that Kalibeng River Section have abundant nannofossils and based on the nannofossil analysis, from older to younger, the studied stratigraphic sequence indicates a more detailed age determination as follows: the Marl Unit of Kalibeng is NN10-NN18 (Middle Miocene to Pliocene), Calcareous Sandstone Unit of Sonde is NN19-NN20 (Pliocene-Pleistocene), and Calcareous Claystone Unit of Sonde is NN20-NN21 (Pleistocene). Keywords: calcareous fine clastics, nannoplankton, Miocene to Pleistocene, Kendeng

Item Type: Article
Uncontrolled Keywords: calcareous fine clastics, nannoplankton, Miocene to Pleistocene, Kendeng
Subjects: Q Science > QE Geology
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: Ir., MT SITI UMIYATUN CHOIRIAH
Date Deposited: 08 Sep 2021 10:21
Last Modified: 08 Sep 2021 10:30
URI: http://eprints.upnyk.ac.id/id/eprint/26625

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