It wasn't until 1912 that meteorologist Alfred Wegener hypothesized that Earth's continents had once been ... 200 million ...

THE discontinuous sialic continents floating in the continuous ... elevated this material above the oceans to make the Laurasia and Gondwanaland of the palæogeographer.

He has unrivalled credentials, based upon a special knowledge of South Africa, combined with comparative study of that sub-continent and ... story of Gondwana and Laurasia, considered separately.