Q1. Which of the following statements is not correct about Tertiary coal?
A It is also known as brown coal.
B It is an inferior quality coal.
C It contributes to about 25% of the total coal production of the country. Correct
D It is found in the rocks of the Oligocene period of the Tertiary Era.
Explanation
Tertiary coal in India is generally younger and lower in quality than Gondwana coal, and it is commonly associated with brown coal or lignite-type deposits. Its occurrence in Tertiary formations, including Oligocene rocks in several regions, is a standard geography fact. The statement that it contributes about 25% of India's total coal production is not correct; India's coal output is dominated by Gondwana coal, while Tertiary coal forms only a much smaller share. Hence that production-share statement is the incorrect one.