Download Colorado River: Origin and Evolution; Proceedings of a by Richard A. Young, Earle E. Spamer PDF

By Richard A. Young, Earle E. Spamer

This number of papers at the geology of the Grand Canyon and the Colorado River is an outgrowth of casual conversations between Colorado Plateau geologists over a interval of a number of years.

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Montana 1911: A Professor and His Wife Among the Blackfeet: Wilhelmina Maria Uhlenbeck-Melchior's Diary and C.C. Uhlenbeck's Original Blackfoot Texts and a New Series of Blackfoot Texts

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Additional resources for Colorado River: Origin and Evolution; Proceedings of a Symposium Held at Grand Canyon National Park in June, 2000 (Monograph)

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Age relations, water volume cal­ culations, and sediment flux rates suggest that the Bidahochi Fonnation does not represent a long-lived lake; sedimentary and fossil evidence suggests a basin with ephemeral shallow lakes and playas. The ancestral Colorado River cannot have contributed a large volume of flow into this basin during Miocene time. One of the major problems concerning the formation of Grand Canyon marily claystone, mudstone, siltstone, and minor fine-grained sand­ is how the Colorado River arrived at its present course.

West is on the right. Figure 2b. (bottom) A comparison of apatite fission-track age-elevation traverses from the Front Range, Colorado, and the Grand Canyon, Arizona. The Bright Angel Trail data are Jrom Naeser and others (1989). -150 I m O) •Ef 3 (0 Tli. CO u \\\ 100 a. ra What Is Apatite Fission-Track Thermochronology? tt i; I* (0 Q. Temperature and chemical composition control fission-track annealing Diamond Creek Lees Ferry • Naeser and others, 1989 OThis study a. < 40 in apatite. In a relatively stable geological environment where tempera­ 80 120 160 Distance-river mile 200 240 tures vary uniformly as a function of depth, apatite fission-track (AFT) age and track lengths decrease systematically with depth (Naeser, 1979; Fitzgerald and others, 1995).

West is on the right. Figure 2b. (bottom) A comparison of apatite fission-track age-elevation traverses from the Front Range, Colorado, and the Grand Canyon, Arizona. The Bright Angel Trail data are Jrom Naeser and others (1989). -150 I m O) •Ef 3 (0 Tli. CO u \\\ 100 a. ra What Is Apatite Fission-Track Thermochronology? tt i; I* (0 Q. Temperature and chemical composition control fission-track annealing Diamond Creek Lees Ferry • Naeser and others, 1989 OThis study a. < 40 in apatite. In a relatively stable geological environment where tempera­ 80 120 160 Distance-river mile 200 240 tures vary uniformly as a function of depth, apatite fission-track (AFT) age and track lengths decrease systematically with depth (Naeser, 1979; Fitzgerald and others, 1995).

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