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Her farm, rented to a neighbor, lay at the head of a coulee or narrow galley, made at some far-off postglacial period by the vast and angry floods of water which gullied these trememdous furrows in the level prairie-furrows so deep that undisturbed portions of the original level rose like hills on either sid~rose to quite considerable mountains.
Therefore, at a time when the littoral regions of the Indian Ocean, the Mediterranean, or the Gulf of Mexico already enjoyed a warmer climate, and became the seats of higher civilizations, immense territories in middle Europe, Siberia, and Northern America, as well as in Patagonia, Southern Africa, and Southern Australasia, remained in early postglacial conditions which rendered them inaccessible to the civilized nations of the torrid and sub-torrid zones.
The hills changed in character, growing more intimately recognizable. They rose higher as the train left the ridge and passed down into the Black River valley, and specifically into the La Crosse valley. They ceased to have any hint of upheavals of rock, and became simply parts of the ancient level left standing after the water had practically given up its postglacial, scooping action.
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.
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