Okavango Dyke Swarm
... that the Okavango Dyke Swarm formed 180 million years ago during the opening of the Indian Ocean?
... that the <b id="mwBas"><a href="./Okavango_Dyke_Swarm" id="mwBaw" rel="mw:WikiLink" title="Okavango Dyke Swarm">Okavango Dyke Swarm</a></b> formed 180 million years ago during the opening of the Indian Ocean?