The present study area covers the Kallakurichi and Tiruvannamalai districts which form the northeastern part of the Southern Granulitic terrain of peninsular India. It is represented by charnockites and Granitic gneisses. Petrographic study of these present rock types aims to understand the textural and mineralogical variations present through the traverse covering the Madurai block, Palghat-Cauvery shear zone and Madras block. It also represents the lithological characters present in the study area. Based on the present petrological study, it consists of dominant Charnockite as compared to Granitic gneisses. Charnockites are fresh and unaltered and not comparable with the gneisses which exhibit foliated features and deformation. Granitic gneisses are more felsic as compared to the charnockites, as they are dominant in quartz and feldspar. The present study suggests that the petrographic characters of Charnockite and Granitic gneisses deduce the igneous and metamorphic activities and represent distinctive textural characters of geologic processes