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Stratigraphy of India - the study of rock layers and their ages - is a special case. It studies the time from between two major mass extinctions, around 600 million years ago to about 65 million years ago. Fossil-bearing rocks that are exposed at the surface within India, or which can be dredged from the sea outside of its boundaries belong to this time period and are studied in detail by stratigraphers. However, only a small fraction of these fossils have been studied in detail. The stratigraphy of India is the study on rock layers and their age. The focal point for this subject is fossils found on land or sea outside Indian borders but on land in India's territory. The study of these fossil-bearing rocks is conducted by the stratigraphers. In India, about 1% of the total number of fossils have been studied in detail. These fossils have been studied in detail for stratigraphy purpose in mostly four sections, respectively: 1. The Cambrian rocks of India seen from the Adi Suba area till the Pachmarhi area in a horizontal distance of respectively 100 and 110 km, which was a part of a lagoon. 2. The Paleozoic rocks from Trilok Tal to Nainital region which included Solan district and Haridwar region, between 25 and 30 km. 3. The Triassic rocks from Bijawar belt till the Cuddapah region, which was a distance of about 500 km. This included Narmada district, Godawari and Bastar region. 4. The Jurassic rocks from the Bhilwara area to a long stretch of 1500 km, which was a part of the Himalayan range. These included Bilaspur area on one side and on the other side, it extended from Alwar to Bihar on both sides of the Ganga river at a distance of 600 km. A. Cambrian rocks. The Cambrian rocks of India are seen from the Adi Suba area till the Pachmarhi area in a horizontal distance of respectively 100 and 110 km i.e. vertically about 8000 mts. The Cambrian rocks were covered by the sedimentary rocks of about 200 km to the east and by the Deccan traps lava to the west, which was a part of a lagoon. B. Paleozoic rocks strata were studied in detail for stratigraphy purpose from Trilok tal to Nainital region which included Solan district and Haridwar region, between 25 and 30 km i.e. vertically about 2000 mts. The Paleozoic rocks were deposited by the Arabian Sea and were covered by the Deccan traps lava to the west, which was a part of a lagoon. C. Triassic rocks strata were studied for stratigraphy purpose from Bijawar belt till the Cuddapah region, which was a distance of about 500 km i.e. vertically about 4000 mts. Till this period, there was no land connection between North and South India and only sea separated them and they underwent orogeny in these two regions separately. After this period, during deposition of Cuddapah terrane, Coromandel Coast extended on both sides of Ganga river i.e. cfa1e77820
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