By Richard A. Young, Earle E. Spamer
This selection 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 numerous years.
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Extra 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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To Paleocene Canaan Peak Formations in the Table Cliff and Range deformation). From Cretaceous to present, reactivation of Plateau region. Where the conglomerates of the Grand Castle overlie structural weaknesses has developed several superimposed basins with sandstone of either the Kaiparowits or Iron Springs Formations, the complex histories. This paper concentrates on the Paleocene to early contact is marked by an abrupt change from sandstone to boulder con Oligocene stratigraphy and basin evolution of southwestern Utah.
Mount Evans, Figure 2). (Pazzaglia and Kelley, 1998). The middle Tertiary PAZ in eastern Grand Canyon is analogous to that found in the Colorado The northern Front Range is best characterized as a basement arch CHAPTER FIVE Plateau-Basin and Range transition. 41 Summary Three interesting interpretations result from this study. First, the atures until 15 Ma. This pattern may suggest that Laramide structures amount of stratigraphic separation across Laramide structures in in the central and eastern canyon were buried by sediments shed from Grand Canyon was greater in the past than is observed now.
2. The AFT age range of 40 to 75 Ma below the base of the partial annealing zone is siinilar 3. 5 km of denudation occurring dur ing early Laramide deformation (70 to 55 Ma). 4. 5 pm, indicative of rocks within the PAZ. Similarly, cooling history of the northern Front Range. In these areas a sin old AFT ages (>100 Ma) are found along the western margin of the gle stage of rapid cooling during Laramide time is indicated by Front Range along the Elkhorn thrust fault (Bryant and Naeser, 1980). the track-length data.
