Life Might Have Gotten Started Just 300 Million Years After the Earth Formed - by ScottyJ_PhD
This ‘tree-like’ structure is among the oldest microfossils on Earth. The microbes that created it lived on the sea-floor near hydrothermal vents, and they metabolised iron, sulfur and carbon dioxide. Nuvvuagittuq Supracrustal Belt, Québec, Canada. Credit: D. Papineau.
Not only does the new research suggest a biological origin for the fossils, it also suggests early diversity, with lifeforms obtaining energy from different sources. Mineralized chemical by-products in the rock suggest that microbes in the Belt lived off iron, sulfur, and maybe carbon dioxide and light – a form of photosynthesis.that “using many different lines of evidence, our study strongly suggests a number of different types of bacteria existed on Earth between 3.75 and 4.
To rule out geological and chemical explanations for the fossils, the team put the samples through various tests. Viewing paper-thin slices of the rock under microscopes, they determined that the filaments are better preserved in fine quartz, which is less susceptible to metamorphic change than rough quartz. This suggests that the filaments were not created through metamorphism .
After completing this careful program of analysis, the team believes that living organisms are the most likely explanation for the filaments in the Belt, but there always is room for uncertainty. The possibility remains that the ‘fossils’ were formed through non-living processes.could indicate complex prebiotic forms on early EarthHaematitic chert , which contains tubular and filamentous microfossils. The dark green volcanic rock in the top right was formed by hydrothermal vents on the seafloor.
The discovery has potentially substantial implications for the search for life elsewhere in the Solar System. It means that in the right conditions, life can form very fast, and could be anywhere. But you don’t have to take my word for it.
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