Cerro Overo
... that the volcanic crater Cerro Overo formed about 77,000 years ago?
... that the volcanic crater <b id="mwB1w"><a href="./Cerro_Overo" id="mwB10" rel="mw:WikiLink" title="Cerro Overo">Cerro Overo</a></b> formed about 77,000 years ago?