Which are the types of coal formation based n their geological ages? Where are they found in India? -Geography

Which are the types of coal formation based n their geological ages? Where are they found in India? -Geography
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Coal is an extremely important energy resource. It has been formed from the compression of plant materials over thousands of years. Coal deposits in India are of two distinct geological ages. The earliest coal deposits are of Permian age formed about 270 million years ago. At that time, South Africa, South America, Antarctica, Australia, India and Madagascar formed a landmass called Gondwanaland. Coal formed in Gondwanaland are known as Gondwana Coal. Other deposits of Tertiary age (30-60 million years) have been formed comparatively recently. These are known as Tertiary Coal. The following table gives the distribution of coal fields in India according to their geological type. Coalfields Locations State Area Tertiary Coalfields Meghalaya Cherranpunji, Mawlong and shillong Assam Mikir Hills Arunachal Pradesh Namchik and Namphuk fields Nagaland Gondwana Coalfields West Bengal - Jharkhand Raniganj, Jharia, Bokaro and Karanpur coalfields of Damodar valley River valleys in south India Mahanadi valley, Son valley, Godavari valley and wardah valley The above is not an exhaustive list but merely an indicator of the important coal sources according to geological type in India. Coalfields are present in almost all the states of India.
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