Chapter 738
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Speaking on periodical elevation and subsidence of the equatorial and polar regions, and ensuing changes of climate, Dr. Winchell, Professor of Geology in the University of Michigan, says: “As the movements here contemplated are cyclical, the same conditions would recur again and again; and accordingly the same fauna might return again and again to the same region, with intervals of occupation by another fauna. Progressive sedimentation would preserve the records of such faunal alterations; and there would be presented the phenomena of ’colonies,’ ’reäpparitions,’ and other faunal dislocations in the vertical and horizontal distributions of fossil remains. These phenomena are well known to the student of geology.” (Op. cit., p. 281.)