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Excerpt from Collected Papers of Harold W. Fairbanks Previous to the deposit of the miocene-tertiary this region had assumed topographical features somewhat similar to those of the present day, but during the Miocene a great submergence took place and only the tops of the highest ranges rose above the water. The Tertiary beds, consisting of sands and clays, were deposited in the previously eroded valleys, and to-day somewhat mask the real geological structure. The Miocene which forms a large part of the central and southern parts of Ventura County, extends up Soledad Cafion nearly to the Mojave Desert. While beds of the same age in the valley of the Piru completely cut off the Sierra Libre from the San Emedio range and extend through to Antelope Valley. The beds rise to an altitude of over it. About the sides of Frazer Mountain, where they are quite undisturbed and present a somewhat terrace-like appearance. The surface in places has apparently undergone scarcely any erosion since the elevation from beneath the sea. 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.