Chazy Formation
...that the earliest fossil reef formations that show high biodiversity, containing the earliest corals, form the mid-Ordovician Chazy Formation, reaching from Tennessee to Labrador?
...that the earliest fossil <a href="./Reef" id="mwDiY" rel="mw:WikiLink" title="Reef">reef</a> formations that show high <a href="./Biodiversity" id="mwDic" rel="mw:WikiLink" title="Biodiversity">biodiversity</a>, containing the earliest <a href="./Coral" id="mwDig" rel="mw:WikiLink" title="Coral">corals</a>, form the mid-<a href="./Ordovician" id="mwDik" rel="mw:WikiLink" title="Ordovician">Ordovician</a> <b id="mwDio"><a href="./Chazy_Formation" id="mwDis" rel="mw:WikiLink" title="Chazy Formation">Chazy Formation</a></b>, reaching from <a href="./Tennessee" id="mwDiw" rel="mw:WikiLink" title="Tennessee">Tennessee</a> to <a href="./Labrador" id="mwDi0" rel="mw:WikiLink" title="Labrador">Labrador</a>?