PALEONTOLOGY STUDY OF BRANCHING CORAL FROM ACROPORA GENUS IN UJUNGGENTENG AREA, SUKABUMI DISTRICT, WEST JAVA WAHYU DWIJO SANTOSO

• Main Author: Dwijo Santoso, Wahyu
• Format: Theses
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/34585
• Institution: Institut Teknologi Bandung

Study on paleontology aspect for Acropora corals are very rare, even has never been done. In fact, the presence of Acropora corals are found on many limestones outcrop in Indonesia. Therefore, paleontology study is needed to understand the process that occurs in Acropora, starting from when alive, and become fossilized on limestone. One location that shows the distribution of coral Acropora which exposed in good condition along the Ujunggenteng Beach, Sukabumi District, West Java, at coordinates 70 21 '31.2 "- 70 22' 30" S and 1060 24 '12.2 "- 1060 25' 30" E . To understand the aspects of paleontology with well, detailed mapping has done and supported by laboratory analysis The results of morphology observation, Acropora corals in Ujunggenteng area consists of five species: Acropora cervicornis, Acropora palifera, Acropora gemmifera, Acropora humilis, and Acropora palmata. The results of morphology observation is supported by quantitative analysis. It showed that the Acropora corals Ujunggenteng area can be divided into two major groups. Group A consist of Acropora palifera, Acropora gemmifera, and Acropora humilis. Group B consist of Acropora cervicornis and Acropora palmata. iii Based on paleontology analysis, Acropora corals in Ujunggenteng area can be grouped into three biofacies association; Acropora cervicornis - Acropora palmata (thanatocoenose), Acropora gemmifera - Acropora humilis, and Acropora cervicornis - Acropora palifera. Each of biofacies association have different paleoecology, which indicated by differentiation of paleobathymetry and paleotemperature. After morphostratigraphy analysis, the three biofacies associations showed terrace morphology. Terrace morphology is occurred caused by sea level change and supported by tectonic factor. After biofacies association analysis, limestone facies analysis was performed for limestone in the Ujunggenteng area.Limestone facies in Ujunggenteg can be divided into three facies group which proposed as: Shoreface – thanatocoenose coral, Open shelf – thanatocoenose coral, and Shelf margin – biocoenose coral.