Cueros de Purulla
... that Cueros de Purulla volcano had a large eruption 7820 years ago and was later a source of obsidian?
... that <b id="mwBq0"><a href="./Cueros_de_Purulla" id="mwBq4" rel="mw:WikiLink" title="Cueros de Purulla">Cueros de Purulla</a></b> volcano had a large eruption 7820 years ago and was later a source of <a href="./Obsidian" id="mwBq8" rel="mw:WikiLink" title="Obsidian">obsidian</a>?