Excerpt from Bulletins of American Paleontology, Vol. 60: 1971 In the thick, monotonous flysch succession comprising most of the Great Valley Sequence, Radiolaria are far more abundant than any other kind of invertebrate fossils. During the course of the investigation a rich, diversified, well-preserved assemblage of Radio laria was recovered from the Upper Cretaceous portion of the Great Valley Sequence. Samples were collected in this study from measured sections from Contra Costa County in the south to Tehama County in the north. In general, the best preserved Radiolaria occur in limestone nodules and concretions associated with the mudstones, shales, and siltstones of this flysch succession. The mudstones, shales, and siltstones oft-en contain abundant Radiolaria. However, the Radiolaria extracted from these Iithotypes are not nearly so well preserved as those occurring in the limestones. 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.