Chemosynthetic Microfossils in Barberton Hydrothermal Veins

Filamentous microfossils preserved in subseafloor hydrothermal vein systems of the Barberton greenstone belt in South Africa indicate microbial life thriving on chemical energy approximately 3.42 billion years ago. Discovered in pillow lavas of the Onverwacht Group, these cellular remains colonized conduit walls created by low-temperature hydrothermal fluids. Their morphological and chemical signatures suggest methanogens or methanotrophs metabolizing compounds from ultramafic volcanic substrates, representing organisms that derived energy from geochemical reactions rather than sunlight.