Eastern Block of the North China Craton
... that the oldest rock in the Eastern Block of the North China Craton is a 3.8- to 3.6-billion-year-old trondhjemitic piece of gneiss?
... that the oldest rock in the <b id="mwBRY"><a href="./Eastern_Block_of_the_North_China_Craton" id="mwBRc" rel="mw:WikiLink" title="Eastern Block of the North China Craton">Eastern Block of the North China Craton</a></b> is a 3.8- to 3.6-billion-year-old <a href="./Trondhjemite" id="mwBRg" rel="mw:WikiLink" title="Trondhjemite">trondhjemitic</a> piece of <a href="./Gneiss" id="mwBRk" rel="mw:WikiLink" title="Gneiss">gneiss</a>?