These ancient mounds may not be the earliest fossils on Earth after all

A new look at 3.7-billion-year-old structures suggests tectonics, not life, formed them

mounds in the rock record

PERPLEXING PEAKS  In 2016, scientists suggested these small mounds (arrows, one outlined by a dashed line) were stromatolites formed by microbes 3.7 billion years ago, but a new study suggests they were formed by tectonic forces.

A.C. Allwood et al/Nature 2018

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