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

Phys.org reports that researchers 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 biosignatures in layered rock called chert discovered in India—a carbon-rich stone that's three point five billion years old. Discoveries like this help researchers understand when and how microbial life first emerged on our planet.

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