Several facts in distribution-such as the great difference in the marine faunas on the opposite sides of almost every continent-the close relation of the tertiary inhabitants of several lands and even seas to their present inhabitants-the degree of affinity between the mammals inhabiting islands with those of the nearest continent, being in part determined (as we shall hereafter see) by the depth of the intervening ocean-these and other such facts are opposed to the admission of such prodigious geographical revolutions within the recent period, as are necessary on the view advanced by Forbes and admitted by his followers.
Geografi banakuntzari buruzko zenbait egitatek hala nola, ia kontinente guztietan alde bateko eta besteko itsas faunek duten diferentziak, lehor eta are itsaso batzuetako tertziarioko biztanleek egungoekin duten lotura hertsiak, irletako eta haietatik hurbilen dauden kontinenteetako ugaztunen artean dagoen ahaidetasun mailak, aldez, gero ikusiko dugun moduan, bitartean duten ozeanoaren sakonerak determinatuak, eta antzeko beste egitate batzuek erabat galarazten dute Forbesek proposatu eta haren jarraitzaileek ontzat harturiko hipotesien arabera beharrezkoak diren aldi modernoko geografi iraultzak onartzea.