Excerpt from A d104-Book of Geology: Intended as an Introduction to the Study of the Rocks and Their Contents This is nominally the fourth edition of a work which first appeared in 1889. But so many additions and alterations have been made that it is practically a new book. The changes were so extensive as to necessitate the resetting in new type of the entire work; and the publishers have taken advantage of this to introduce both larger and clearer type and a larger page. Many new illustrations have also been added, several of these being from photographs taken by myself especially for this book. In Geology, as in all the other sciences, constant and rapid progress is being made. The changes in, and additions to our knowledge of the rocks have been especially great in the strata which form the beginning and the end of the geological series respectively - O-the pre-cambrian and Cambrian Formations at the beginning, and the Glacial Series near the end. Special care has been devoted to bringing these portions of the book up to date. It has been remarked that geology cannot be learnt from boo but it is equally true that geology cannot be learnt without books. Certainly the rocks themselves are the best teachers, but it has taken thousands of years to acquire the power of interpreting the signs of those rocks, and the student must make himself master of the principal facts that the numerous workers in this field of knowledge have already collected. 1 would urge the student to go direct to nature. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.