Phys.org

Layered rock in India shows potential signs of microbial life dating to 3.5 billion years ago

A team of researchers reports that they may have found rock containing some of the earliest forms of microbial life on Earth. Their study, published in the Proceedings of the National Academy of Sciences, describes the biosignatures found in this 3.5-billion-year-old, carbon-rich, layered rock, called chert.