Excerpt from Flora of the Black Hills of South Dakota The outcrop of the Cretaceous sandstone forms the foothills, and that of the Jura formation and the Red Beds makes the so-called Race Track, a more or less continuous valley between the foothills and the hills proper. The Race Track is much broader on the south side and forms the larger part of the Minnekahta Plains. On the east side the Carboniferous limestone belt forms a series of hills, and on the west side, where the strata are nearly horizontal, a broad plateau, the Lime stone District. As the slates and schist are comparatively soft, the center of the Black Hills is lower, except where the granite or igneous roeks come to the surface and form the highest peaks in the range. 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.