Correct option is D
Tertiary coals are younger in geological age compared to Gondwana coals. These coals are typically found in regions that experienced more recent geological activity, specifically in the Eocene, Miocene, and Pliocene periods. The following coalfields contain tertiary coals:
1.
Neyveli Coalfields (Tamil Nadu):
· Contains lignite, a form of tertiary coal.
· Formed during the Miocene epoch.
2.
Makum Coalfields (Assam):
· Rich in high-sulfur tertiary coals.
· These coals were deposited during the Eocene epoch.
Information Booster:
1.
Tertiary Coal Characteristics:
· Relatively younger (about 65 million years old).
· Found mostly in northeastern states and some southern regions of India.
· Includes lignite and high-sulfur coal.
2.
Gondwana Coals vs. Tertiary Coals:
·
Gondwana Coals: Older coals formed around 250-300 million years ago.
·
Tertiary Coals: Formed during the Cenozoic era (less than 65 million years ago).
3.
Key Locations of Tertiary Coals:
· Assam (Makum), Meghalaya, Nagaland, Tamil Nadu (Neyveli).
Additional Knowledge:
1.
(a) Raniganj Coalfields, West Bengal:
· Contains Gondwana coals, which are older.
· Known for high-grade bituminous coal.
2.
(b) Neyveli Coalfields, Tamil Nadu:
· Contains lignite, a type of tertiary coal.
· Major source of lignite in India.
3.
(c) Talchir Coalfields, Odisha:
· Contains Gondwana coal, not tertiary coal.
· Known for bituminous coal deposits.
4.
(d) Makum Coalfields, Assam:
· Contains tertiary coals with high sulfur content.
· Significant deposits of Eocene-age coal.
Key Points:
1.
Tertiary Coal: Found mainly in Neyveli (Tamil Nadu) and northeastern regions (Assam, Meghalaya).
2.
Gondwana Coal: Found in older coalfields such as Raniganj and Talchir.
3.
Lignite: A lower-grade, brownish coal often associated with tertiary deposits.
4.
Makum Coalfields: Known for high sulfur and quality tertiary coal deposits.
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