Excerpt from Shorter Contributions to General Geology, 1921 In the Seaman well unit C is far from coher ent. In the percentage log it appears very irregular. The only generalization that sug gests itself is that this unit is distinctly calca reous in the lower part, containing very little sand, but grows sandy toward the top, appar ently approaching, more or less by oscillations, the rise of base-level that separates it from unit B. There is more room for considerable difference of opinion about the homogeneity of this unit in the Seaman well than about that of any other unit in the section. If it is to be subdivided, the dividing line would be drawn at feet, separating a distinctly sandy and shaly unit above from a succession of black limestones and shales below. To me these two unit-s have not appeared sufficiently distinct, and no glauconite bed was found to indicate a boundary. The correlation with the Rudd well supports this view. In the Rudd well unit C is very regular and coherent, although it has five sandy zones which may correspond to the five maxima of sand in the Seaman well. If, in accordance with this correlation, the sand between and feet in the Rudd well corresponds to the sand between and feet in the Seaman well, the ratio between the part of the section below this sand in the Rudd well compared with the same part of the section in the Seaman well is slightly less than the ratio between the combined units C and C' in the two wells. Thus. 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.