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By Donald R. Prothero, Robert J. Emry

The transition from the Eocene to the Oligocene epoch, happening nearly forty seven to 30 million years in the past, used to be the main dramatic episode of climatic and biotic swap because the dying of the dinosaurs. The light tropical climates of the Paleocene and early Eocene have been changed via smooth weather conditions and extremes, together with glacial ice in Antarctica. the 1st a part of this e-book summarizes the most recent info within the relationship and correlation of the strata of overdue heart Eocene via early Oligocene age in North the USA. the second one half studies just about all the real terrestrial reptiles and mammals chanced on close to the Eocene-Oligocene boundary, within the White River Chronofauna--from the turtles, snakes and lizards to the typical rodents, carnivores, oreodonts and deer of the Badlands. this can be the 1st entire remedy of those themes in over sixty years, and may be important to vertebrate paleontologists, geologists, mammalogists and evolutionary biologists.

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Extra resources for The Terrestrial Eocene-Oligocene Transition in North America

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Notharctus robustior is common in the lower unit of the Adobe Town Member, especially the middle red bed sequence of Roehler (1973) in the southern part of the Washakie Basin. Plentiful N. , 1987). —Specimens of Hyopsodus from the Kinney Rim Member and the middle unit of the Adobe Town Member are similar to H. paulus. Unfortunately the material is fragmentary, currently preventing unambiguous assignment to that species. The presence of H. paulus from the middle unit would indicate an earliest Uintan age, rather than Bridgerian, for the middle unit as it occurs with larger-bodied earliest/early Uintan taxa (Dolichorhinus, Amynodon).

89) from Uinta "A" are actually from Uinta "Bl" in Osborn's (1929) terminology (see Prothero and Swisher, 1992, p. 54). Peterson (in Osborn, 1895), Riggs (1912), and Osborn (1929) all found the lower 500 feet of the Uinta Formation (all of Uinta "A" in modern parlance) in Wagonhound Canyon to be unfossiliferous. Kay (1934, plate XLVI) indicates that Sthenodectes priscus comes from a horizon about 30 feet above the base of the Green River Formation in Willow Creek, which he correlated with Uinta A.

Geological Survey Map 1-1526. Ryder, R. , T. D. Fouch, and J. H. Elison. 1976. Early Tertiary sedimentation in the western Uinta Basin, Utah. Geological Society of America Bulletin 87:496-512. Scott, W. B. 1932. An introduction to geology, 3rd ed. Macmillan, New York, 441 pp. Scott, W. B. 1945. The Mammalia of the Duchesne River Oligocene. Transactions of the American Philosophical Society 34:209-253. Scott, W. , and H. F. Osborn. 1887. Preliminary report on the vertebrate fossils of the Uinta formation, collected by the Princeton expedition of 1886.

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