Not only are Niagara Falls and gorge of postglacial origin but there was no Niagara River as such before the Ice Age.
The Preglacial valley has been submerged and filled with Postglacial sediment to a depth of nearly 800 feet.
Although the actual duration of the Ice Age is by no means accurately known, we can be quite sure that the time represented is far longer than that of postglacial time.
Postglacial warping of the land has brought the whole region to the present condition.
The flat bottom of the valley has resulted from the filling with sediment of a postglacial lake in the valley.
First Postglacial Retreat, Achenschwaenkung in the Alpine region.
The Daun or final Postglacial advance of the glaciers of the Alps, estimated at 7,000 B.
Present range of mammals of the deserts and steppes of eastern Europe and southern Asia, which also invaded western Europe during the glacial and Postglacial stages (vertical lines).
From evidence afforded in Kent's Hole, Devonshire, Dawkins is led to believe that the sabre-tooth tiger survived in Britain until Postglacial times.
There is, however, some evidence of the coexistence of man with the mastodon and other postglacial animals in Illinois and elsewhere.
Footnote 138: This whole subject of supposed preglacial or interglacial men is still in great confusion and uncertainty, and is complicated with questions, still debated, as to the ages of the supposed glacial and postglacial deposits.
Postglacial volcano recessed on shady southern side by the process of nivation.
The appearance of these truly human postglacial Palæolithic peoples was certainly an enormous leap forward in the history of mankind.
Many of the valleys of our present rivers are but patchworks of preglacial, interglacial, and postglacial courses (Fig.
The complicated glacial and postglacial history of the lakes is recorded in old strand lines which have been traced at various heights about them, showing their areas and the levels at which their waters stood at different times.
But not all the present route of the river through the dalles has been followed throughout the entire postglacial history of the stream.
Into this sandstone it has since cut a notable gorge, a good illustration of a postglacial valley.
The postglacial portion of the valley (b to c) is everywhere narrow, and especially so where cut in sandstone.
The postglacial cut through the moraine is about ninety feet deep.
The most striking example of postglacial erosion is the dalles of the Wisconsin, and even this is but a small gorge for so large a stream.
Wherever the preglacial valleys were completely filled, the postglacial drainage followed lines which were altogether independent of them.
In the former case the present drainage is through valleys which are preglacial in some places, and postglacial in others.
When preglacial valleys were filled by the drift in spots only, the postglacial streams followed them where they were not filled, only to leave them where the blocking occurred.
This ridge is continuous, except for the postglacial gorge cut by the tributary entering from the east, and must have been in existence in preglacial times.
Another postglacial body of water, Lake Idaho, once united the lakes of Southeastern Oregon.
This postglacial lake once filled the present basin of the Great Salt Lake and Utah Lake, its outlet flowing northwest from Ogden into Snake River.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "postglacial" in a variety of sentences. We hope that you will now be able to make sentences using this word.
