Photo, Ridge Studio; Courtesy Ogden Chamber of Commerce
A great ledge in Ogden Canyon near Ogden, Utah. Therock, still retaining its stratification, was deposited layerupon layer horizontally mostly as sand upon the floor of a seawhich covered the region fully 25,000,000 years ago. That thesea was of very early Paleozoic (i.e., Cambrian) age has beenproved by fossils in associated strata. Long after their deepburial and consolidation within the earth, the strata were subjectedto tremendous mountain-making pressure, notablyaltered to a rock called “Quartzite,” raised high above sealevel, and tilted almost vertically. Then through long ages(millions of years) overlying rocks of great thickness havebeen cut away (eroded) by weathering and stream action,laying bare the ledge as we see it to-day.
Popular Science Library
EDITOR-IN-CHIEF
GARRETT P. SERVISS
AUTHORS
WILLIAM J. MILLER HIPPOLYTE GRUENER A. RUSSELL BOND
D. W. HERING LOOMIS HAVEMEYER ERNEST G. MARTIN
ARTHUR SELWYN-BROWN ROBERT CHENAULT GIVLER
ERNEST INGERSOLL WILFRED MASON BARTON
WILLIAM B. SCOTT ERNEST J. STREUBEL
NORMAN TAYLOR DAVID TODD
CHARLES FITZHUGH TALMAN
ROBIN BEACH
ARRANGED IN SIXTEEN VOLUMES
WITH A HISTORY OF SCIENCE, GLOSSARIES
AND A GENERAL INDEX
ILLUSTRATED
VOLUME THREE
P. F. COLLIER & SON COMPANY
NEW YORK
Copyright 1922
By P. F. Collier & Son Company
MANUFACTURED IN U. S. A.
GEOLOGY
The Science of the Earth’s Crust
BY
WILLIAM J. MILLER
Professor of Geology, Smith College
P. F. COLLIER & SON COMPANY
NEW YORK
In the preparation of this book the author hasattempted to present, in popular form, the salientpoints of a general survey of the whole great scienceof geology, the science which deals with the history ofthe earth and its inhabitants as revealed in the rocks.
The use of technical and unusual terms has beenreduced to a minimum compatible with a reasonableunderstanding of the subject by the layman. Eachof the relatively few scientific terms is explainedwhere first used in the text, and a glossary of commongeological terms has