Distribution of Tondo Clastics in the Wakoko and Wambona Rivers, Buton Island, Southeast Sulawesi

The Buton Island is located in the the subduction zone between the Eurasian, Indo-Australian, and Pacific Plates. This island is exposed at the most southern part of southeast Sulawesi, adjacent to the Muna and the Tukang Besi Islands. Recent investigations have suggested that the Buton Island had experienced multiple tectonic events during the Neogene period, with the first collision occurred between Southeast Sulawesi/Muna and Buton and the second collision occurred between Buton and Tukang Besi. The objective of this study is to present the Neogene history of the Buton Island based on identification of the Tondo Formation. This study investigated the clastic of Tondo Formation in the Wakoko River (South Buton) and the Wambona River (North Buton) to identify the strata of stratigraphy, age and depositional environment, provenance, and evolution of the Tondo Formation in the Buton Island.