Excerpt from An Introduction to Sedimentary Petrography: With Special Reference to Loose Detrital Deposits and Their Correlation by Petrographic Methods As its title implies, the book is intended to serve simply as a. General introduction to the subject and its applications. A working knowledge of elementary crystallography and optical physics is assumed, this being an essential preliminary to all petrographical studies. In this connexion such standard works as Dana's System of Mineralogy or Iddings' Rock Minerals should, if necessary, be consulted. 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.