diffrence between godwana coal and tertiary coal
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1. The gondawa coal formation is 200 million years ago.
the tertiary formation is 55 million years ago
2. 80 coal fields are in the lower gondawa system.
33 coal fields are identified as tertiary system
3. It is found in Damodar,Son,Mahandi and Wardha-Godavri river valley.
Tertiary coal occurs in Assam,Arunachal Pradesh,Meghalaya and Nagaland
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