Excerpt from Elements of Geology: A Text-Book for Colleges and for the General Reader
The growth of geologic science makes it imperative in a work like this, designed as a general treatise and for advanced students, to discuss some of the current problems and the new theories. Just now this is especially true, as changing views on the physical side of the science relating particularly to the earth's origin are unsettling some long-accepted theories (see pp. 88, 296). The teacher should not blame the book of he finds that a few interrogations have been taken the place of supposed facts. The theory of earth-genesis is fundamental to so many physical problems that the change in that important theory will mark a new epoch in the development of the science.
It has been necessary to largely rewrite some sections of the book and to insert several new topics. Few changes, however, have been made in the text where not required by advancing knowledge; and the spirit and style of the revered author have been held as the model.
Acknowledgement of assistance on special subjects is due to many friends, especially as follows: To John M. Clarke, Palæozoic invertebrates; David White, Palæozoic and Triassic plants; T. W. Stanton, Postpalæozoic invertebrates; C. R. Eastman, fishes; F. E. Lucas, reptiles and mammals; C. E. Dutton, earthquakes; C. R. Van Hise, metamorphism; T. C. Chamberlin, earth-genesis, etc.
For new illustrations thanks are tendered to many individuals to whom credit is generally given in the titles; to Macmillan & Co. for the use of several figures from the works on Palæontology by A. S. Woodward and Karl A. von Zittel; to A. P. Brigham and G. K. Gilbert for contribution on illustrations from Brigham's Text-Book of Geology and Gilbert and Brigham's Physical Geography.
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