Paraconcavistylon
... that the Eocene-age plant Paraconcavistylon was described from a "Rosetta Stone" fossil?
... that the <a href="./Eocene" id="mwBhw" rel="mw:WikiLink" title="Eocene">Eocene</a>-age plant <i id="mwBh0"><b id="mwBh4"><a href="./Paraconcavistylon" id="mwBh8" rel="mw:WikiLink" title="Paraconcavistylon">Paraconcavistylon</a></b></i> was described from a "Rosetta Stone" fossil?