An article published in the journal “Science Advances” reports the results of a thorough examination of a rock dated between 3.75 and 4.25 billion years offering evidence of the presence of microfossils. A team of researchers discovered in a rock found in the Nuvvuagittuq Greenstone Belt, Quebec, fossilized structures that bear similarities to microfossils from a later era and to today’s bacteria living in hydrothermal vents. This discovery offers new evidence that at the time, there were already diversified life forms after the evidence published in an article in the journal “Nature” in March 2017. In that case, the nature of the structures sparked controversy but the ones presented in the new study have greater complexity.