Prepared in cooperation with the Geological Survey of Wyoming and the Dept. of Geology of the University of Wyoming as part of a program of the Dept. of the Interior for development of the Missouri River basin.
By U.S. Geological Survey and U.S. Bureau of Mines -- Geology of the Chama-southern San Juan Mountains wilderness study area, Colorado / by Maurice R. Brock and David R. Gaskill -- Geophysical investigation of the Chama-southern San Juan Mountains wilderness study area, Colorado / by Jeffery C. Wynn -- Geochemical evaluation of mineral resources in the Chama-southern San Juan Mountains wilderness study area, Colorado / by Maurice R. Brock, George J. Neuerberg, and Theodore Botinelly -- Oil and gas potential of the Chama-southern San Juan Mountains wilderness study area, Colorado / by Robert T. Ryder -- Metallic and coal resources of the Chama-southern San Juan Mountains wilderness study area, Colorado / by Alec E. Lindquist.
Initially, this work was designed to document and study the diversification of modern mammalian groups and was quite successful and satisfying. However, as field and laboratory work continued, there began to develop a suspicion that not all of the Eocene story was being told. It became apparent that most fossil samples, especially those from the American West, were derived from similar preservational circumstances and similar depositional settings. A program was initiated to look for other potential sources of fossil samples, either from non-traditional lithologies or from geographic areas that were not typically sampled. As this program of research grew it began to demonstrate that different lithologies and different geographic areas told different stories from those that had been developed based on more typical faunal assemblages. This book is conceived as an introduction to non-traditional Eocene fossils samples, and as a place to document and discuss features of these fossil assemblages that are rare or that come from rarely represented habitats.
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