National Geographic News, Reporting Your World Daily

Sunday, November 22, 2009

Photo: India Basins Half a Billion Years Older Than Thought


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A diagram shows various rock layers in India's Vindhyan Basin.

A study released in July 2008 found that the basin formed a billion years ago—up to 500 million years earlier than previously believed—lending support to the theory that Earth was completely covered in snow and ice about 700 million years ago.

Image courtesy Joseph Meert