Excerpt from A Review of the Non-Marine Fossil Mollusca of North America To aid the reader, who may be assumed to be unfamiliar with the details of western geology and with the names which the different series Of strata in the West that are necessarily often referred to in this article have received from different investigators, the following summary Of facts and Opinion is given. 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.