series of geological formations
...that the Caloris Basin on Mercury, one of the largest impact basins in the Solar System, is surrounded by a series of geological formations believed to have been produced by the basin's ejecta?
...that the <a class="mw-redirect" href="./Caloris_Basin" id="mwD_Q" rel="mw:WikiLink" title="Caloris Basin">Caloris Basin</a> on <a href="./Mercury_(planet)" id="mwD_U" rel="mw:WikiLink" title="Mercury (planet)">Mercury</a>, one of the largest <a href="./Impact_crater" id="mwD_Y" rel="mw:WikiLink" title="Impact crater">impact basins</a> in the <a href="./Solar_System" id="mwD_c" rel="mw:WikiLink" title="Solar System">Solar System</a>, is surrounded by a <b id="mwD_g"><a href="./Caloris_Group" id="mwD_k" rel="mw:WikiLink" title="Caloris Group">series of geological formations</a></b> believed to have been produced by the basin's <a href="./Ejecta" id="mwD_o" rel="mw:WikiLink" title="Ejecta">ejecta</a>?