Geomorphology and geology of Lake Linumunsut, Tongod, Sabah

Abstract

Lake Linumunsut in central Sabah is a drowned river valley caused by landslide debris damming one of Namatoi River tributaries. The lake sits on mudstone layers of Kapilit Formation deposited about 12-15 million years ago. The morphology of the lake has changed slightly over the last 30 years due to siltation. The lake is filled with mud and very finegrained sands up to 3 meters thick eroded from the mudstone and thin sandstone in the catchments area. The lake will not be completely filled up with sediments in the near future as the unsettled mud is easily flushed out from the lake during heavy rain. However the morphology of the lake will change drastically once stream down cutting along Linumunsut River reach the bottom of the lake.

Buffer Zone Prediction for Simulated Earthquake-Induced Slope Failures in Mesilou, Kundasang, Sabah, Malaysia

“…Trusmadi Formation is divided into two parts namely Slate Formation and Phyllite Trusmadi Formation [11] which consist of turbidite deposition and argillaceous rocks which metamorphosed to green schist facies with quartz veins from tectonic processes [12][13]. Crocker Formation is deep water deposition comprises of sandstones, shale and interbedded of sandstone and shale units with particle size ranges from fine to coarse grains.…”