What is Tertiary coal?
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Tertiary coal is found in the rocks of the Oligocene period of the Tertiary Era. It is about 15 to 60 million years old. The Tertiary coal is also known as the 'brown coal'. ... It is an inferior type of coal in which the carbon varies between 30 per cent in Gujarat and Rajasthan to 50 per cent in Assam.
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