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April 14, 2022 08:45 pm

Microfossils May Be Evidence Life Began 'Very Quickly' After Earth Formed

Scientists believe they have found evidence of microbes that were thriving near hydrothermal vents on Earth's surface just 300m years after the planet formed -- the strongest evidence yet that life began far earlier than is widely assumed. From a report: If confirmed, it would suggest the conditions necessary for the emergence of life are relatively basic. "If life is relatively quick to emerge, given the right conditions, this increases the chance that life exists on other planets," said Dominic Papineau, of University College London, who led the research. Five years ago, Papineau and colleagues announced they had found microfossils in iron-rich sedimentary rocks from the Nuvvuagittuq supracrustal belt in Quebec, Canada. The team suggested that these tiny filaments, knobs and tubes of an iron oxide called haematite could have been made by bacteria living around hydrothermal vents that used iron-based chemical reactions to obtain their energy. Scientific dating of the rocks has suggested they are at least 3.75bn years old, and possibly as old as 4.28bn years, the age of the volcanic rocks they are embedded in. Before this, the oldest reported microfossils dated to 3.46bn and 3.7bn years ago, potentially making the Canadian specimens the oldest direct evidence of life on Earth. Now, further analysis of the rock has revealed a much larger and more complex structure -- a stem with parallel branches on one side that is nearly a centimetre long -- as well as hundreds of distorted spheres, or ellipsoids, alongside the tubes and filaments.

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