SEQUENCE STRATIGRAPHY CONCEPT APPLIED TO THE MAIN MEMBER OF UPPER CIBULAKAN FORMATION OUTCROPS IN CIPAMINGKIS RIVER, JONGGOL AREA, NORTHWEST JAVA BASIN

摘要

The Northwest Java Basin is an back-arc basins in Indonesia. It is bordered by Sunda Shield in the North, Bogor Through in the South, Karimun Jawa in the East, and Seribu Platform in the West. Sequence stratigraphy is the study of sedimentary rocks relationship within chronostratigraphically framework in response to a cycle of relative change in a base level (sea level), where a sequence is bounded by correlative conformity surface. This paper applies sequence stratigraphic concepts to a stratigraphic succession of the Cipamingkis River, Northwest Java Basin, West Indonesia. The data used in this study are detailed observations and careful analysis of Middle Miocene outcrops in the area. Several lithofacies are be identified in the research area; Bioturbated Sandstone, Laminated Sandy Shale, Fossiliferous Sandstone, Shale, Skeletal Limestone, Bioturbated Shale, and Cross-Stratified Sandstone. The research area is divided into three sedimentary facies; Middle Shoreface Facies, Lower Shoreface Facies, and Offshore Facies. All facies are deposited in shallow marine environment. Based on the integration between lithofacies analysis with the stratigraphic succession, a nearly complete sequence is observed at the outcrops in Cipamingkis River. The components of the observed sequence are Sequence Boundary (SB-1), Lowstand System Tract (LST), Transgressive System Tract (TST), Maximum Flooding Surface (MFS), and Highstand System Tract (HST).