Table 8 The geological formation of Greater Chennai
No | Period | Epoch | Formation | Lithology |
|---|---|---|---|---|
1 | Quaternary | Holocene to Pleistocene | Cuddalore | Soils, Alluvium (River/Coastal), Coastal sand, Black clay, Laterite, Fine to coarse sand |
2 | Tertiary | Eocene to Pliocene | Sandstone, Shale, Green Shales, Marine sediments | |
3 | Upper Gondwana | Cretaceous | Satyavedu, Sriperumbudur | Black shale, Grey shale, Sandstone, Siltstone |
4 | Azoic | Archaean | Granites, Charnockites, Schist, Gneisses, Dolerite |