If this is the case, subsidences of the land are natural concomitants of a glacial period, and will powerfully aid in removing all evidence of its occurrence.
In the first place, there is evidently this radical difference between the state of Mars now and of the Earth during a glacial period--that Mars has no great ice-sheets spreading over its temperate zone, as the Earth undoubtedly had.
So conversely it will be with the northern hemisphere, while the southern passes through a glacial period.
Many circumstances demonstrate this decreasing temperature, until we arrive at what geologists call the glacial period--one of the winters of the ancient world.
It is odd that Ball does not allude to the obvious fact that there must have been alpine plants before the Glacial period, many of which would have returned to the mountains after the Glacial period, when the climate again became warm.
I cannot feel quite easy about the Glacial period, and the extinction of large mammals, but I must hope that you are right.
The view of Professor Hoernes, who assigns the Mousterian types to the first inter-glacial period of Penck, has received so little support as to render it negligible here.
Therefore an inter-glacial period is indicated as having preceded the Mousterian age.
And the relation of the history of Man to the great variation of climate implied in the expression 'Glacial Period,' may be reasonably expected to receive some elucidation from this branch of study.
The latter period is known to us as the Ice Age or Glacial period.
At first, when traces of a temperate flora and fauna were discovered intercalated between two layers of boulder clay, their presence was explained by the supposition of a mild inter-glacial period.
Again, as Chamberlin suggests, let it be supposed that a Krakatoan eruption every two years would produce a glacial period.
During this same unfortunate first half of the fourteenth century England also suffered from conditions which, if sufficiently intensified, might be those of a glacial period.
Because of these various reasons the advances of the ice during the several epochs of a glacial period might be approximately equal, even if the durations of the periods of storminess and low temperature were different.
Turning from these difficult questions of time, we may now look at the assemblage of land-animals presented by the Post-glacial period.
Glacial period, with an inter-glacial mild period in the middle and great submergence of the continents toward the close.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "glacial period" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
