The stable carbon isotope ratio (13C/12C) of the carbonaceou matter from the basal part of the Vindhyan sub-group, estimated to be about 1200 Ma old, has been measured and the values support a biogenic origin for the incorporated carbon.

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First page of Carbon Isotope Ratio of the Coaly Matter from the Basal Part of the Proterozoic Vindhyan Supergroup
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