A haematite filament attached to a clump of iron (in the lower right), from hydrothermal vent deposits in the Nuvvuagittuq Supracrustal Belt in Québec, Canada is pictured in this undated handout photo obtained by Reuters March 1, 2017. These clumps of iron and filaments were microbial cells and are similar to modern microbes found in vent environments. (Photo/Agencies)
