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The correct answer is option (a): 370 million years. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
This question was asked in UPSC CSE Prelims 2001, GS Paper 1, as Question 49. It falls under Geography > Indian Physical Geography.
This question is rated "moderate". It requires sound conceptual understanding of the topic.
UPSC has asked 45 questions from Indian Physical Geography (under Geography) across multiple years. Visit the topic page to see the full list and year-wise trends.