Free and Discounted Ebooks
Join 130,000 readers! Get our ebook deals straight to your inbox.


With Special Reference to the American Museum Collection

Cover image for


Published: 1915
Language: English
Wordcount: 31,282 / 104 pg
Flesch-Kincaid Reading Ease: 54.2
LoC Categories: Q, AM
Downloads: 1,963
Added to site: 2006.09.17 14538
Genre: Science

tinental elevation the maximum of which was marked by the "Ice Age." The continents are still emerged for the most part almost to the borders of the "continental shelf" which forms their maximum limit. And in the icy covering of Greenland and Antarctica a considerable portion still remains of the great ice-sheets which at their maximum covered large parts of North America and Europe. We are now at the beginning of a long period of slow erosion and subsidence which, if this interpretation of the geologic record be correct, will in the course of time reduce the mountains to plains and submerge great parts of the lowlands beneath the ocean. As compensation for the lesser extent of dry land we may look forward to a more genial and favorable climate in the reduced areas that remain above water.

[Illustration: Fig. 3.--Relative Length of Ages of Reptiles, Mammals and Man.]

Length of Geologic Cycles. But these vast cycles of geographic and climatic change will take millions of years to accompl



Join 120,000+ fellow readers! Get Free eBooks and book bargains from ManyBooks in your inbox. 

We respect your email privacy

login | register

User ID


reset password

Author of the Day

Bill Carson
Bill Carson creates riveting crime novels that leave readers thinking about life. His first book in the Detective Nick Harland series, Necessary Evils, is no exception, looking at how people handle love, loss, lust, greed and many more. As our author of the day, Carson talks to us about his writing habits, who Detective Nick Harland really is and why John Kane does such horrible things.
Read full interview...