The Owens party was merely the vanguard of the great army of brave men and women who have ever since made their dangerous ways into the remotest distances of the mountain and desert West, seeking neither riches of gold nor riches of land, but only more minute bits of the knowledge of the world of our past. Archeologists, geologists, and paleontologists from universities and learned societies the world over have spent liberally of their time, energies, and personal safety to scout out the secrets of mankind’s past in such remote corners of the earth as the Badlands. Year after year additional expeditions, both governmental and privately organized, made their way into this particular area, seeking out the fossil remains which turned up in great numbers. V. F. Hayden of the United States Geological Survey was one of the most diligent of the early explorers. He made trips into the Badlands in 1853, 1855, 1857, and 1866, carrying on detailed and exhaustive studies and eventually unraveling the story of the region’s major geologic features. As Hayden’s reports became more and more widely circulated, various universities found projects of specific interest in one or another phase of the work of uncovering fossil beds; and from year to year Yale, Princeton, Amherst, the universities of South Dakota and Nebraska, and other institutions sent groups into the Badlands for summer work. Gradually, as these several groups exchanged information and reports of progress, it became possible for their scientists to trace back, through the skeletal remains of prehistoric animals, the very processes of the evolution of many entire families in the animal kingdom. Not only are the fossil beds of the Badlands as richly stocked with remains as any such bed in the world, but in a great many instances entire groups of three, four, and five whole skeletons have been found, making it possible for museum workers to re-create almost perfectly the animals as they existed and to set up models of the terrain at various intervals throughout its entire sixty-million-year history.