2.2 Geological Setting
Hard rocks cover more than 95% of the study area. The gneissic rock type is the parent rock seen commonly in the entire study area. Charnockite rock is covered in the southern part of the study area. The pyroxene granulite is grey in colour and granulitic rock with mineral seen on the weathered surface. It consists of diopside, hypersthene, plagioclase, hornblende, biotite, and quartz (Sujatha 2020, Chandra Mohan et al., 2017, Jawahar raj and Prabhakaran 2018). An elevation of the Palani hills ranges from 1163 to 2502m, and Sirumalai hill located in the southeast part of the study area. The plains are dominant in between these hill ranges. Red soil and black cotton soil are highly observed soil types in the study region. In the view of geotechnical properties of soil in the study area are high permeability and fractured rock types.