General geology and influences of grain size distribution on permeability of soil at Kampung Sungai Terah, Gua Musang, Kelantan.

The properties of soil are important in an area. Thus, it is important to study the permeability of soil and their grain size distribution in an area. The study area is located at Kampung Sungai Terah, Gua Musang, Kelantan within the latitude 4° 53’ 14.5” N to 4° 55’ 57.5’’ N and longitude 101° 55’ 53.5” E to 101° 58’ 36.5’’ E which comprised approximately 25km2. The objectives of this research are to produce a geological map of study area at scale 1:25,000 and to investigate the influence of grain size distribution on permeability of soil. The methods that used to produce geological map is by field mapping and Geographic Information System (GIS). The field mapping includes the observation of lithology, geomorphology, and structural geology. The lithology found at study area is granite, limestone, shale and sandstone. Soil analysis is done by laboratory test which is falling head permeability test and sedimentation test. The falling head permeameter is used for permeability test of soil and sedimentation test by pipette is used for grain size distribution of soil. This research showed that the study area is mostly consisted of clays with fine grain soil and have low permeability rate.