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Excerpt from Contributions to the Mineralogy of the Newark Group in Pennsylvania, Vol. 7: January, 1910 The trap masses are, as already mentioned, indicated by prominent elevations, although they can not be accurately mapped on this basis, for in places the sedimentary rocks are exposed far up the flanks of the hills, and again the trap descends to the level of the streams. The exact boundaries between the trap and shale can, however, be determined by the character of the soil, especially in the case of the northern mass, where the change from red-brown shale soil to the yellow of that derived from the trap is particularly marked. The present map, representing the results of some two weeks of 'field work, has been prepared as carefully as possible with this point in view. 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.

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