The evidence, however, does not show that there may not have been more than two glacial epochs.
This period, in the New World as in the Old, had its glacial epochs.
Thus Cordeiro accounts for alternating mild and glacial epochs.
He is satisfied that in France there is evidence of three glacial epochs and two well-marked interglacial horizons.
Two glacial epochs, at all events, have been recognised generally both in Europe and North America.
Two glacial epochs with one protracted interglacial epoch are now generally admitted.
Hence, like their confrres in northern Europe, they speak of “first” and “second” glacial epochs.
The occurrence of two glacial epochs, separated by a long interval of temperate conditions, has been proved.
During the glacial epochs the interior of Asia was well watered and full of game which supplied the primitive human hunters.
The winter of 1922 witnessed the greatest geologic change in the earth's surface since the last of the Glacial epochs.