SEDIMENTOLOGY OF BONGAYA FORMATION, JAMBONGAN ISLAND, BELURAN, SABAH, MALAYSIA
Keywords:
Bongaya Formation, Jambongan Island, Sedimentology, Facies, Geology SabahAbstract
Jambongan Island is located at Northeast Borneo, Sabah. The exposed Bongaya Formation on this island is a Neogene siliciclastic succession characterized by sandstones, shales, and occasional conglomerates. The formation is Miiocene aged with highly friable nature of the sandstones suggests an age potentially extending into the Early Pliocene. This study utilizes detailed sedimentary logging of 11 outcrops to refine the depositonal framework of the formation. Six distinct facies were identified: Hummocky Cross-Stratified (HCS), Swaley Cross-Stratified (SCS), Horizontally Stratified (Sh), Flaser Bedded Sandstone (FF), Structureless Sandstone (Sm), and Mudstone (M). Three facies associations are identified to represent a progradational, high-energy shoreface model ranging from lower shoreface to foreshore environments. Notably, the absence of the distal shelf-to-transition zone suggests that fair-weather finer grained deposits were either bypassed or eroded by intense storm currents during rapid progradation.
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