ression of the vast geological and climatic changes which occurred dur- ing this period. Next comes the age of the glaciers, whose broad flanks are seen glittering in the sunlight as they stream down the sides of the mountains. Both geo- logical and astronomical causes may have been at work in… … TERTIARY PERIOD-DAWN OF THE MODERN WORLD. the eccentricity of the earth's orbit. If this is correct, we can approximately fix the time of the age of glaciers. It would seem to have begun about 340,000 years ago and to have ended 80,000 years ago. In about 150,000 years to come the orbit of the…
Patents · Water · Lens · Scientific American · Munn · Horse power · Great lakes · Inch stream · Rain making · Electric light · Niagara falls · Typhoid fever · Cubic feet · Feed water
Internet Archive · Public domain (published before 1931). Free to use for anything.
