"Post-Civil War years were extraordinary times in the American West. Clarence King--the larger-than-life geologist, entrepreneur, and bon vivant--led the way. In this marvelously engaging and well-illustrated book, the eminent geologist James Gregory Moore captures the excitement of King and his times."--Richard S. Fiske, Research Geologist and Former Director of the Smithsonian Institution's National Museum of Natural History"Writing from new sources and intimate personal knowledge of the western landscape that challenged King, Moore illuminates the genius, dedication and energy that enabled King to pioneer his acclaimed survey of the United States along the 40th parallel west of the 100th meridian. This adventure-filled book should appeal greatly to Earth scientists, western historians and the general public."--Dallas L. Peck, Emeritus Scientist (and Former Director), U.S. Geological Survey