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Excerpt from Proceedings of the California Academy of Sciences, 1928-1929, Vol. 17: Fourth Series Tertiary deposits are widely spread throughout the general area of the northern Andes in Colombia and Venezuela, occu pying extensive basins in the present drainageisystems of Lake Maracaibo, the Orinoco, and the Magdalena rivers. The chief interest of this paper centers in the early Tertiary de posits Oi the Magdalena and its tributaries, and especially in those of the Eocene and their environments. 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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