Ogygis Undae
... that the Martian dunes of Ogygis Undae consist of two different sand types, and look similar to the dunes in Grand Falls, Arizona?
... that the <a href="./Mars" id="mwvw" rel="mw:WikiLink" title="Mars">Martian</a> dunes of <b id="mwwA"><a href="./Ogygis_Undae" id="mwwQ" rel="mw:WikiLink" title="Ogygis Undae">Ogygis Undae</a></b> consist of two different sand types, and look similar to the dunes in <a class="mw-redirect" href="./Grand_Falls,_Arizona" id="mwwg" rel="mw:WikiLink" title="Grand Falls, Arizona">Grand Falls, Arizona</a>?