The Evolution of the Earth And Its Inhabitants a Series of Lectures Delivered B
The Evolution of the Earth And Its Inhabitants a Series of Lectures Delivered B
Richard Swann Lull
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These "breaks" in sedimentation are representative of loss of record and are called "intervals"; they are regarded as the closing times of the eras. AND ITS INHABITANTS 73 During these intervals when the continents are highest and largest, the oceans are smallest in areal extent, the separate continents are often united by land-bridges as Panama unites the Americas, such bridges alter the direction of the great ocean streams like the Gulf Stream, the high mountain ranged! alter the directions o...f the air currents and take out of therm their moisture so that great desert areas arise like our inter-\ Rocky Mountain country, and because of these vast changes \ nearly all of the major movements are accompanied by glacial/ climates. Such mighty changes in the geography, topography, and climate of the earth react strikingly upon the life of the polar and temperate belts and so disarrange it that the major "intervals" following the "revolutions" are ^poken of as the criFical times In the earth's history critical not only For the geography, separating or unTrtng continental masses, but also for life, since as a result of the lands then becoming high and cool to cold in places and elsewhere moist or dry, vast domains of organisms are forced to adapt themselves to the altered conditions, or to migrate into more favorable areas, or to die out and make room for the rising hordes of fitter types.
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