In the regular course of events the southern hemisphere would in its turn be subjected to a severe Glacial period, with the northern hemisphere rendered warmer; and then the southern temperate forms would invade the equatorial lowlands.
Gertaeren abio normalean, hego hemisferioa ere glaziaraldi gordinaren pean egonen zen, eta ipar hemisferioa beroago bihurtuko zen; eta orduan hegoko klima epeletako formek beterri ekuatorialak inbadituko zituzten.