Planktonic and Benthic Foraminifera Miocene on Sandstone Unit of Bentang Formation in Pangandaran, West Java

Abstract

The research in Pangandaran was due to the presence of exposed rock lithology and the
presence of fossil content, either macrofossil or microfossil. Research sites are located at
108°27'46.55'' to 108°30'29.88''E and 7°41'35.54'' to 6°38'53.60''. This study was conducted to
determine the distribution of foraminifera contained in the constituent sandstone units of the Bentang
Formation. The research was conducted at 7 (seven) points of location of sandstone outcrops.
Analysis and identification of foraminifera using a binocular microscope after foraminifera
preparation. The distribution areas of the sandstone units of the study area are in the Cimanggu, Bula
Krandu and Karangbenda areas. Age datum markers that are characterized by planktonic
foraminifera fossils, namely Sphaerodinellopsis multilobe and Globigerinoides ruber. Benthic
foraminifera dominated by Lenticulina suborbicularis, Nouvigerina ampulaceae, Cibicides
tenuimargo, Anomalinoides globulosus, Heterolepa praecincta, Ammonia convexa reflects a shallow
marine bathymetry zone or mid neritic (50-100m). Based on the content of planktonic and bentonic
foraminifera, the sandstone units of the Bentang Formation were deposited during the Middle
Miocene (N12-N13) age in a shallow marine depositional environment