#TITLE_ALTERNATIVE#

• Main Author: JAYANGGITO (NIM: 12008035); , AZMY
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/18129
• Institution: Institut Teknologi Bandung

The research area is located in 359625 – 363052 m N and – 448080 m E (UTM 50N, WGS84). Administratively, it is located in Long Adiu Village, Gongsalak District, Malinau Regency, East Kalimantan Province. Phisiographically, the research area is located in west <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> edge of Tarakan Basin. The research area consists of four geomorphological units which are Anticline Hills <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> Unit, Homocline Hills Unit, Homocline Valley Unit and Aluvial Plain Unit. Stratigraphically, the research area are divided into four unofficial units which are, old to young, Sandstone Unit, Limestone Unit, Sandstone-Siltstone Unit, and Alluvial Unit. Sandstone Unit may correlates to Malinau Formation. Limestone Unit and Sandstone-Siltstone Unit may correlate to Sembakung Formation. The geological structure which are present in the field are dipping of bedding, folding which consist of anticline with fold axis heading NE-SW, and two strike slip faults which are Upthrown Dextral Fault heading W-E and Upthrown Sinistral Fault heading NW-SE. Those geological structure are predicted to happen because of tectonic activity during Plio-Pleistocene with compressive force heading NW-SE. The geological history of the area began on Middle Eocene, where Sandstone Unit were form, then during Late Eocene the Limestone unit were deposited conformably, after that the Sandstone-Siltstone Unit were deposited interfingeringly with Limestone Unit. And then, the tectonic activity which happen Plio-Pleistocene caused the geological structure. The geological process continue erotionally that deposited Alluvial Unit and forming morphological landscape which are seen and present today.