How would you classify the types of coal on the basis of geographical ages?
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In India, coal occurs in two geological ages- Gondwana and tertiary deposits.
(i) Gondwana is a little over 200 million years in age. The major resources of Gondwana coal, which are metallurgical coal, are located in Damodar Valley, West-Bengal, Jharkhad, Jharia, Raniganj, Bokaro are important coalfields.
(ii) Tertiary deposits are only 55 million years old. Tertiary coals occur in the north eastern states of Meghalaya, Assam, Arunachal Pradesh and Nagaland.
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The coal deposits on the basis of their age can be classified as Gondwana coal which is approximately 105 million years old and tertiary coal which is just approximately 88 million years old
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