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Excerpt from Proceedings of the American Philosophical Society, Vol. 46: Held at Philadelphia for Promoting Useful Knowledge; January to December, 1907 II. The franciscan series - The Franciscan series, which IS the one of chief interest, rests upon the eroded surface of this granite as exposed on the northwest end of Montara Mountain near Devil's Slide. The lowest beds of the series are conglomerates containing boulders of granite that lie directly on the igneous rock. The petrographic evidence shows that the sandstone is derived mainly from the erosion of this or some similar igneous rocks, and is necessarily arkose. The Franciscan series proper consists of five beds in the fol lowing order. I. Coarse Conglomerate containing large boulders of granite. 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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