Glen Rock
... that the Glen Rock is very gneiss?
... that the <b id="mwCa4"><a href="./Glen_Rock_(boulder)" id="mwCa8" rel="mw:WikiLink" title="Glen Rock (boulder)">Glen Rock</a></b> is very <a href="./Gneiss" id="mwCbA" rel="mw:WikiLink" title="Gneiss">gneiss</a>?