δ34S
... that δ34S values in certain Archean pyrites suggest that sulfate-reducing organisms were present 3,470 million years ago?
... that <b id="mwAc4"><a href="./Δ34S" id="mwAc8" rel="mw:WikiLink" title="Δ34S">δ<sup id="mwAdA">34</sup>S</a></b> values in certain <a href="./Archean" id="mwAdE" rel="mw:WikiLink" title="Archean">Archean</a> <a href="./Pyrite" id="mwAdI" rel="mw:WikiLink" title="Pyrite">pyrites</a> suggest that <a class="mw-redirect" href="./Sulfate-reducing_bacteria" id="mwAdM" rel="mw:WikiLink" title="Sulfate-reducing bacteria">sulfate-reducing organisms</a> were present <span about="#mwt31" class="nourlexpansion plainlinks" data-mw='{"parts":[{"template":{"target":{"wt":"Ma","href":"./Template:Ma"},"params":{"1":{"wt":"3470"}},"i":0}}]}' id="mwAdQ" style="white-space:nowrap;" typeof="mw:Transclusion"><a class="external text" href="https://geoltime.github.io/?Ma=3,470" rel="mw:ExtLink nofollow">3,470</a><span typeof="mw:Entity"> </span>million years ago</span>?