Question

The oldest rock system in the Indian stratigraphic succession is:

• A. Dharwar Supergroup
• B. Vindhyan Supergroup
• C. Cuddapah Supergroup
• D. Gondwana Supergroup

Hint:

{Oldest to youngest (simplified): Dharwar → Cuddapah → Vindhyan → Gondwana}. Remember this order for stratigraphy questions.

Answer 1

The Correct Option is A

Step 1: Understanding Indian stratigraphic succession.
The Indian stratigraphic succession represents the chronological order of rock formations in India, ranging from the oldest Precambrian rocks to the youngest recent deposits. The earliest part of this succession belongs to the Archean Eon.
Step 2: Age of the given supergroups.
The Dharwar Supergroup belongs to the Archean age and represents some of the oldest crustal rocks of the Indian shield. The Cuddapah and Vindhyan Supergroups are Proterozoic in age, while the Gondwana Supergroup is much younger, belonging to the late Paleozoic to Mesozoic era.
Step 3: Comparing the options.
(A) Dharwar Supergroup: Archean age and the oldest rock system in India.
(B) Vindhyan Supergroup: Younger Proterozoic rocks.
(C) Cuddapah Supergroup: Proterozoic age, younger than Dharwar.
(D) Gondwana Supergroup: Much younger sedimentary sequence.
Step 4: Conclusion.
Since the Dharwar Supergroup represents the oldest Archean rocks in the Indian stratigraphic succession, the correct answer is (A) Dharwar Supergroup.