GEOLOGY

The geological formations in the district are of Archean and recent age. Archean formations comprise of greisses and charrockiates. Recent formations are alluvium and laterite. Archeans occupy the midland and highland regions of the district having rock types of basic charrockiates and horn-blende-biotite greiss. The remaining portions in the coastal area are covered by laterite, alluvium, lime,-shells, lignified woods, etc. Archean formations like foliated horn-blende-biotite greiss (gray or white in colour) is one of the main rock types in the northern portion of the district. Recent formations like laterite is developed on a limited scale along the coastal areas.