. The age of mammals in Europe, Asia and North America. Mammals, Fossil; Paleontology. 122 THE AGE OF MAMMALS San Juan Basin of northern New Mexico, 1,500 feet, overlying the Torrejon and Puerco series; (4) the 'Wasatch'of the Big Horn of Wyoming, 2,391 feet (Loomis). Phase II. (1) The lower portion of the Huerfano Formation near Spanish Peaks, Colorado. The Wind River Formation (Hayden) of northern Wyoming, 500 feet. These formations all contsdn Coryphodon and Eohippus, and may be*col- lectively known as Lower Eocene. Below them were either mammalif-. Fig. 37. — In the heart of the Lower Eoce
. The age of mammals in Europe, Asia and North America. Mammals, Fossil; Paleontology. 122 THE AGE OF MAMMALS San Juan Basin of northern New Mexico, 1,500 feet, overlying the Torrejon and Puerco series; (4) the 'Wasatch'of the Big Horn of Wyoming, 2,391 feet (Loomis). Phase II. (1) The lower portion of the Huerfano Formation near Spanish Peaks, Colorado. The Wind River Formation (Hayden) of northern Wyoming, 500 feet. These formations all contsdn Coryphodon and Eohippus, and may be*col- lectively known as Lower Eocene. Below them were either mammalif-. Fig. 37. — In the heart of the Lower Eocene badlands on Gray Bull River, Big Horn Basin, Wyo. Wasatch Formation. Zone of Coryphodon, primitive horses, tapirs, etc. Photo- graph by American Museum of Natural History, 1896. erous beds of undoubted Basal Eocene age (Puerco and Torrejon) or de- posits of equivalent age ( Fowkes, Almy, Fig. 36, p. 119) resting on the Upper Cretaceous. The fact of paramount interest is the great thickness of these Lower Eocene depositions, amounting in western Wyoming to 4,000 or 5,000 feet. For the beds which intervene between this Coryph- odon Zone and the summit of the Cretaceous, the thickness indicates an enormous period of time, ample even for the transformation of the diminutive ancestors of Pantolamhda into the bulky Coryphodon (Figs. 30 and 31). The materials of which these various deposits of the Coryphodon Zone. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Osborn, Henry Fairfield, 1857-1935. New York, The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectpaleontology, bookyea
