The Potomac Formation PDF Download

Excerpt from The Potomac Formation I had already made, in the summer of 1891, in company with Prof. R. T. Bill, an expedition to Texas and southwestern Arkansas, for the purpose of studying the Trinity group, which also has the same strati graphical relations and rests upon the Carboniferous. One important locality for fossil plants was discovered and a good collection was made. These plants correspond quite closely to the most ancient Potomac forms, such as are found on the James River at the Dutch Gap Canal. With this general grasp of the subject as a whole, in May, 1892, I resumed the detailed study of the format-ion in Virginia, Maryland, and farther north. In the greater part of this I was assisted by Mr. David White. The general plan adopted was that of crossing the formation at as many instructive points as it was possible to select, for the pur pose Of describing all variations that were found to take place in pass ing from its landward to its coastward margin, and making careful sections at these points. Without here entering into the details of this expedition, I may say in brief that the principal sections thus made in their order from south to north, were. 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.