Discussion
Commercial banded iron formations of India are mostly of :
Answer: C
India's commercial BIFs are mostly of Proterozoic and Archaean age.
Banded iron formations formed mainly in the Precambrian, when the oceans held dissolved ferrous iron that was precipitated as the atmosphere and oceans became oxygenated. India's large haematite deposits, in the Iron Ore Group of Singhbhum-Odisha, the Bailadila range of Chhattisgarh and the Dharwar craton of Karnataka and Goa, lie in Archaean to early Proterozoic greenstone and supracrustal belts.
Palaeozoic, Mesozoic and Cenozoic rocks contain other kinds of iron ore, such as oolitic ironstones and laterites, but not the major BIF deposits.
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