Early traces of life discovered in 3.5-billion-year-old rock

Researchers have identified what appear to be the earliest traces of life within 3.5-billion-year-old rock formations discovered in India's Singhbhum Craton. The dark stripes found within the chert, also known as hornstone, are believed to be biological in origin. These ancient rocks formed in a volcanically active region of the primordial ocean, which would have provided a rich habitat for microbial life.

Chert is a particularly exciting type of rock for scientists studying early life because it has the potential to preserve extremely old organic materials. Some of the oldest organic remnants ever found have been located in chert from volcanic deposits. However, accurately dating materials of this immense age presents significant scientific challenges.

The discovery in the Singhbhum Craton, a geological region in eastern India, adds to our understanding of life's earliest beginnings on Earth. The presence of these biological signatures in such ancient rock suggests that life may have emerged relatively early in the planet's history, thriving even in harsh, volcanically active environments.