Excerpt from Primitive Man
Working upon these data, Prof. Croll asserts that the first of these periods of great eccentricity began years ago, and lasted years; the second began years Since and lasted years; the third commenced years ago and lasted years. This would give us, since the termination of the last glacial era (or eras), years. But it is certain that man of the river-drift period lived in pre-glacial times, and if we accept the conclusion that the most recent glacial era commenced years ago, we must allow not less than years ago as the date of the close of the Pliocene period, and the probable first appearance of man. Other theories which have been proposed to account for the Glacial Age, such as variations in the intensity Of solar radiation, the movement Of the earth from a colder into a warmer region of Space, alteration in the axis of the earth and others, are fully stated and criticized in the twelfth chapter of Sir John Lubbock's Prehistoric Man, as are also investigations into existing deposits and formations with a view to ascertaining the probable antiquity of the stone and bronze ages.
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HRD. Condition: New. New Book. Shipped from UK. Established seller since 2000. Seller Inventory # LX-9780265541999
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