Threadlike filaments pressed in rock may be the remnants of archaea that burped methane near hydrothermal vents 3.42 billion years ago. If so, these strands in rock excavated in South Africa around a decade ago, would provide the earliest direct evidence of a methane-based metabolism.
https://ift.tt/3hCQW31 via /r/science https://ift.tt/3eXWpzQ
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