Identifier: evolutionofearth00barr (find matches)
Title: The evolution of the earth and its inhabitants; a series delivered before the Yale chapter of the Sigma xi during the academic year 1916-1917
Year: 1918 (1910s)
Authors: Barrell, Joseph, b. 1869 Schuchert, Charles, 1858-1942 Woodruff, Lorande Loss, 1879-1947 Lull, Richard Swann, 1867- Huntington, Ellsworth, 1876-1947
Subjects: Evolution Climatology Human beings -- Influence on nature Earth
Publisher: New Haven, Yale university press (etc., etc.)
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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unreliable that it was not thoughtwise to include the vast Archeozoic and Proterozoic eraswithin the scheme. The time values of the several includederas are not proportionally indicated, too much space by farbeing given to the Cenozoic because of its biologic interest.As a matter of fact, its duration is more nearly comparableto that of Permian time. The curves are necessarily generalized, for there wasneither space nor necessity for greater detail. In the altitu-dinal curve, the upslope of the diastrophic peaks signifiesrising diastrophism; the downslope, the period of erosionbefore the continents are low enough to have mantles of sedi-ment spread upon them. A greater or lesser part of the peakand downslope represents, therefore, the unrecorded intervalbetween eras or periods, as the case may be. The tangentiallines drawn to the diastrophic peaks show the relation of aseries of movements: a gradual rise culminating in the greatrevolutions. Were the Cenozoic compressed into its normal
Text Appearing After Image:
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