Sentences with phrase «glacial cycles spanning»

Not exact matches

The archaeological record suggested that very roughly 150,000 individuals spanned Europe and Asia, living in small groups of 15 to 25 — and that their total numbers fluctuated greatly during the several climate cycles (which included harsh glacial periods) that occurred during the half a million years they inhabited Earth, before going extinct 40,000 years ago.

(29) Another respected climatologist explained that the old view of «a grand, rhythmic cycle» must be replaced by a «much more rapid and irregular succession,» in which the Earth «can swing between glacial and interglacial conditions in a surprisingly short span of millennia (some would say centuries).»