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By assuming such a succession of events we can more easily explain why there has not been a greater extermination of species, both terrestrial and aquatic, in polar and temperate regions during the glacial epoch, and why so many species are common to pre-glacial and post-glacial times.
One step at least we gain by the Bedford sections, which those of Amiens and Abbeville had not enabled us to make. They teach us that the fabricators of the antique tools, and the extinct mammalia coeval with them, were all post-glacial. So early as the first year of the nineteenth century, a remarkable paper was communicated to the Society of Antiquaries by Mr.
They were at that time what the terrible urmans of North-West Siberia are now, and their population, inaccessible to and untouched by civilization, retained the characters of early post-glacial man.
Trivial inequalities of surface were arbitrarily cut down or built up and covered with leaves and pine-straw to disguise the fact, and whenever a tree or anything worth preserving stood in the way here came the loaded barrow and the barrowist, like a piece of artillery sweeping into action, and a fill undistinguishable from nature soon brought the path around the obstacle on what had been its lower side, to meander on at its unvarying rate of rise or fall as though nothing except the trees and wild flowers had happened since the vast freshets of the post-glacial period built the landscape.
This ravine is not only post-glacial, but also posterior in date to the fluviatile or mastodon-bearing beds.
The extension of the sea affected by its own action in post-glacial times is probably less than the millionth part of that affected by glacial action during the last glacier period. The direction of the flow of the ice-sheet to which all the main features of this wonderful region are due was in general southward.
The highest post-glacial water-marks are well preserved in all the upper river channels, and they are not greatly higher than the spring flood-marks of the present; showing conclusively that no extraordinary decrease has taken place in the volume of the upper tributaries of post-glacial Sierra streams since they came into existence.
Save a few tribes clustering in the less-accessible highlands, the "savages" represent a girdle which encircles the more or less civilized nations, and they occupy the extremities of our continents, most of which have retained still, or recently were bearing, an early post-glacial character.
In regard to the lines of movement in Moen, M. Puggaard believes, after an elaborate comparison of the cliffs with the interior of the island, that they took at least three distinct directions at as many successive eras, all of post-glacial date; the first line running from east-south-east to west-north-west, with lines of fracture at right angles to them; the second running from south-south-east to north-north-west, also with fractures in a transverse direction; and lastly, a sinking in a north and south direction, with other subsidences of contemporaneous date running at right angles or east and west.
Every storm that falls upon them wastes them, carrying away their decaying, disintegrating material into new formations, until they are no longer recognizable without tracing their transitional forms down the Range from those still in process of formation in some places through those that are more and more ancient and more obscured by vegetation and all kinds of post-glacial weathering.
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