Abstract
According to new radiometric determinations, the Chorhat Sandstone (Kheinjua Formation, Semri Group) is much older (1628 and 1632 Ma) than previously thought. This makes the carbonaceous fossils here described not only the oldest, but also the only reliably dated fossil record of the Vindhyan Supergroup, India. The new fossils represent a Chuaria-Tawuia assemblage with other carbonaceous remains of uncertain biologic affinities. Their size range (0.02–3.5 mm) indicates a transitional phase in the evolution from micro- to mega scopic organisms. Alternatively, low oxygen levels may have induced small size.
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