Earth’s oldest stromatolites and the search for life on Mars
Hand sample of Dresser Formation stromatolite, showing a complex layered structure formed of hematite, barite, and quartz, and a domed upper surface (dome arrow). Credit: Keiron Hickman-Lewis and colleagues The earliest morphological traces of life on Earth are often highly controversial, both because non-biological processes can produce relatively similar structures and because such fossils have …
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