Loktak Lake - Geology

Geology

Cretaceous limestone, the Disang with Serpentinites (Lower to Middle Eocene–Upper Cretaceous), the Surmas and the Tipams (Miocene) are the dominant rock formations in the catchment of the Manipur basin. Higher reaches of hills have the Disang and Tipam groups of rocks while Surma group occurs in the lower reaches. Grey sandstone–grit–conglomerate–limestone sequences intruded by serpentinites containing minor amounts of enstalite, chromite, amphiboles and magnetite constitute the Disang formation. Argillaceous and arneceous sequence represents the Surma and Tipam groups, respectively.