IDENTIFICATION OF MIOCENE LIMESTONE AND LARGE BENTHIC FORAMINIFERA ASSEMBLAGES FROM CIBODAS FORMATION IN SURADE AREA, WEST JAVA, INDONESIA

Daffa Rafli Prinaldi, Santi Dwi Pratiwi

Abstrak


ABSTRACT UNESCO Global Geoparks preserve outstanding geological records that are essential for reconstructing regional paleoenvironmental histories and evolution. Among these records, large benthic foraminifera and limestone facies are widely recognized as reliable indicators of shallow-marine depositional environments. This research aims to analyze limestone facies distribution and large benthic foraminifera assemblages within the Cibodas Formation in the Surade area, West Java, which forms part of the Ciletuh Palabuhanratu UNESCO Global Geopark. The limestone of the Cibodas Formation was examined through petrographic analysis to determine lithofacies characteristics and fossil content. The results show that the limestone is composed of boundstone, grainstone, packestone, and wackestone facies. Boundstone is characterized by interlocking skeletal components, indicating in-situ framework construction, with micritization processes commonly observed. Grainstone consists of abundant grain composition, grain supported, plagioclase and quartz minerals are present. Packestone is dominated by skeletal grains, particularly large benthic foraminifera, including Lepidocyclina stratifera, Lepidocyclina (Nephrolepidia) subradiata, Amphistegina bowdenensis, Amphistegina sp., Heterostegina sp., Cycloclypeus sp., and Austrotrilina howchini. Wackestone shows a micrite-supported fabric locally overlain by sparite cement and contains Lepidocyclina stratifera, Amphistegina sp., and Austrotrilina howchini, reflecting relatively lower-energy conditions. The results of this study provide insights into the diversity of limestone facies and large benthic foraminifera assemblages in the study area, which are essential for interpreting the paleoenvironmental conditions and depositional setting of the Cibodas Formation in Ciletuh Palabuhanratu. Keywords: Benthic Foraminifera, Cibodas Formation, Limestone, Petrography, Surade


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DOI: https://doi.org/10.24198/bsc.v23i3.68914

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