SEDIMENTATION OF THE CANTAYAN FORMATION IN SIRNASARI, BOGOR, WEST JAVA - INDONESIA

The study area is located in Sirnasari area, Tanjungsari District, Bogor Regency, West Java - Indonesia and geographically located at coordinates 6 o 36'30" - 6 o 39'30" Longitude and 107 o 08'15 " - 107 o 10'30" Latitude. Stratigraphy of the study area consists of five lithology units (from old to young), they are mudstone unit, breccia unit, sandstone - claystone unit, Basalt unit, and Alluvial unit. The mudstone Unit was deposited in the inner to outer neritic environment dominated by wave shore face mechanism. The breccia and mudstone - sandstone units were udstone unit is equivalent to the Cibu lakan Formation, while breccia and mudstone - sandstone Unit is the equivalent of the Cantayan Formation. Turbidite facies which found in this unit are classic turbidite facies that consists of thinly - bedded and thickly - bedded sandstone, massive sandstone facies, conglomerates, and debris flow facies. The facies change reflected a change of deposition environment, which is influenced by sea level change at the time of deposition.