Via R&D:

The scalding-hot sea that supposedly covered the early Earth may
in fact never have existed, according to a new study by Stanford
University researchers who analyzed isotope ratios in 3.4
billion-year-old ocean floor rocks. Their findings suggest that the
early ocean was much more temperate and that, as a result, life
likely diversified and spread across the globe much sooner in
Earth’s history than has been generally theorized.