Discussion
In central India, which of the following is correct statement in relation to Vindhyan group ?
Answer: A
The key's answer is that Vindhyan rocks are thickest along the southern margin of the supergroup, which is a faulted contact.
The Vindhyan basin of central India is bounded on the south by the Son-Narmada lineament, a deep fault zone. The basin subsided most along this margin, so the sedimentary pile is thickest there, in the Son valley sector, where it reaches several kilometres, and it thins northwards onto the Bundelkhand massif.
So the rocks are not thickest near the Bundelkhand massif, nor uniformly along the axis, and the large variation in thickness rules out the statement that there is none.
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