Scientists found Rosetta Stone of supervolcanoes
Scientists have found the ``Rosetta Stone'' of supervolcanoes, those giant pockmarks in the Earth's surface produced by rare and massive explosive eruptions that rank among nature's most violent events.
Acheulian stone tools, dating back to about 1.51 million years ago, have been discovered at Attirampakkam in the Kortallayar River Basin, about 60 km northwest of Chennai.