Excerpt from Ancient Sea-Margins, as Memorials of Changes in the Relative Level of Sea and Land 1. Taking observed facts for our data, we know that there was a time subsequent to the completion of the rock formations, when this island (not to speak of other parts of the earth) was submerged to the height of at least 1700 feet. The proofs lie plain and palpable before our eyes, in the soft detrital masses, mixed in many places with marine shells, which overlie the hardened formations, reaching in some places to that height above the present sea-level. 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.