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AUTHOR(S): Teti Syahrulyati, Vijaya Isnaniawardhani, Mega Fatimah Rosana, Winantris
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ABSTRACT Sajira region is geographically located in Banten Province this location was chosen because it has a complete stratigraphic sequence that characterizes the Rangkasbitung Basin. The distance to Sajira from Bogor is approximately 2 hours away. The research objective is to study the stratigraphic sequence of the Rangkasbitung Basin in the Sajira area. The Bojongmanik Formation is a typical formation of the Rangkasbitung Basin according to previous researchers in lithology there are two rock units namely the Claystone Unit of sandstone and limestone intercalation and the Sandstone unit of claystone and limestone intercalation. Observation method used to record existing geological information related the formation of exogenous and endogenous processes that work in the area. Determination of age used qualitative method while to know the depositional environment, quantitative method used based on the comparison of Planktonic foram content to the Benthic. Granulometry analysis used to determine the depositional environment quantitatively based on the grain size sorting. The results of geologically there are 3 rock units and intrusive rocks. The claystone and sandstone intercalation are the oldest units in the Sajira area based on the fossil content of Hastigerina phraesiphonifera, Orbulina universa, Orbulina suturalis, Globorotalia praemenardiand Globogerinoides subquadratus age range (N9 - N12) in deposited the Outer Neritik. As for the Sandstone and Claystone intercalation unit containing fossils of Orbulina bilobata, Globigerinoides trilobus, Globoratalia minardi, Globigerinoides subquadratus and Orbulina universa age range (N13 - N14) or Upper Middle Miocene, deposited on the edge Neritic environment. This rock unit is covered unconformably by the Genteng Formation which is characterized by the presence of silicifid wood fragments. On the basis of fossil content related to rock age, depositional environment and lithological features which show different characteristics, the Sandstone and limestone intercalation Unit should be separated and given a separate Formation name because it does not match the characteristics of the location the Bojongmanik Formation type. |
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KEYWORDS Lithostratigrafi, Bojongmanik Formation, depositional environment |
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Cite this paper Teti Syahrulyati, Vijaya Isnaniawardhani, Mega Fatimah Rosana, Winantris. (2022) A Study of the Changes of Lithostratigraphy based on Bojongmanik Formation at Sajira, Banten Province, Indonesia. International Journal of Environmental Science, 7, 140-151 |
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