Notes On A Collection Of Reptiles Made By Mr C J Pierson At Fort Smith Arkansas With Remarks On Other Eastern Reptiles Classic Reprint PDF Download

Excerpt from New Reptiles and Stegocephalians From the Upper Triassic of Western Texas On the east Side of the Staked Plains the lower beds are red sandy shales which may be traced from the Canadian River southward to where they disappear beneath the Cretaceous and younger deposits south of Big Springs, in Howard County. These beds shade downward indefinitely into the Double Mountain beds of the Fermo - Carboniferous. The author has repeatedly crossed the line, in every county of Texas where it lies, from the Canadian River on the north as far south as the Triassic appears, and has been unable to draw any line that can be used to separate the two formations. In passing from the towns Seymour, Vernon, Haskell, Anson, and Abilene westward to the Triassic at the base of the Plains, the same indefinite boundary is crossed. The red beds grow more shaly, and in general there is an increase in the amount of gypsum, which may occur in beds from a few inches to as much as 3 feet thick, or may be in fine seams running in all directions through the red sandy clay. The same condition is found in the breaks of the Canadian River and in the great canyons which penetrate into the Plains in Randall, Armstrong, Swisher, and Briscoe Counties. Similar conditions prevail wherever these two formations come together in New Mexico, Arizona, or Wyoming and the adjacent States. 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.