A Positive δ<SUP>13</SUP>C excursion in carbonate and organic fractions from the Palaeoproterozoic Aravalli Supergroup, NW India

Carbon isotope measurements, carried out on carbonate samples from different localities of the early Proterozoic Aravalli Craton, Western India, yield positive δ <SUP>13</SUP>C values up to +11.20%. PDB. This widespread, isotopically anomalous carbonate province, reported from this subcontinent, coincides with the appearance of stromatolites and the development of 'red beds'. These observations support a global paleoenvironment change during the Paleoproterozoic, as reported from other parts of Gondwanaland including the Kapvaal Craton, Africa, and the Sao Francisco Craton, Brazil