 The fauna of the Cauvery Delta is limited to cattle and goats.The town is situated at the western flank of the Kumbakonam-Shiyali ridge which runs along the Kollidam river basin separating the Ariyalur-Puducherry depression from the Nagapattinam depression.This granular ridge projects further eastwards penetrating the Puducherry depression and forms a hard layer of cretaceous rock underneath the sedimentary top soil.