Download Geology of the Colorado Plateau: Grand Junction to Denver, by Fred Peterson, Christine Turner-Peterson PDF

By Fred Peterson, Christine Turner-Peterson

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Published through the yank Geophysical Union as a part of the Field journey Guidebooks Series.

The Colorado Plateau is a largely increased zone within the southern a part of the Western inside of the U.S. that has tremendously nice exposures of higher Paleozoic, Mesozoic, and Cenozoic rocks. the standard of exposures is a fabricated from local uplift within the center and past due Tertiary that prompted quick erosion and deep canyon incision in a semi-arid to arid weather. The constitution of the Plateau contains wide basins, uplifts, and systems in the community bordered by means of monoclines. even though increased in Tertiary time, the Plateau zone used to be a special crustal block via the start of Mesozoic time while it was once principally surrounded through tectonically distinctive areas. top Paleozoic to Cenozoic strata include the list of marine and continental sedimentologic strategies complex in various levels through the interaction among sea-level alterations and tectonism, either in the Plateau zone and in bordering areas. the sphere day trip will provide a chance to work out the fabulous geologic surroundings of the Colorado Plateau and to debate the local sedimentologic and structural heritage.

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Sample text

The visible part of the John Henry Member of the Straight Cliffs Formation (Ksj) is about 500 ft (150 m) thick and consists largely of shoreface sandstone beds. Ksts, Tibbet Canyon and Smoky Hollow Members. shoreline. Southwest of here the same inteIVal again changes facies; the shoreface sandstones are replaced by fluvial sandstones and overbank mudstones that we will see on the west side of the Kaiparowits basin. The lateral transition from offshore marine shales to shoreface sandstones and then to nonmarine beds, illustrates the dramatic facies changes that characterize Upper Cretaceous rocks on the Plateau.

The route then descends into the valley of Calf Creek, cut into fluvial beds of the Kayenta Formation. The route crosses the Escalante River and for several miles (Ian) climbs gradually through the Kayenta Formation and Navajo Sandstone to a summit viewpoint where intertongued white Page Sandstone and red Carmel mudstones are exposed. After the summit, the road gradually descends toward Escalante and the Straight Cliffs escarpment becomes clearly visible to the south (Figure 30). Most of the shoreline sandstones in the escarpment are equivalent to the Blue Gate Shale Member of the Mancos, which we saw earlier today at Caineville (Figure 28).

The visible part of the John Henry Member of the Straight Cliffs Formation (Ksj) is about 500 ft (150 m) thick and consists largely of shoreface sandstone beds. Ksts, Tibbet Canyon and Smoky Hollow Members. shoreline. Southwest of here the same inteIVal again changes facies; the shoreface sandstones are replaced by fluvial sandstones and overbank mudstones that we will see on the west side of the Kaiparowits basin. The lateral transition from offshore marine shales to shoreface sandstones and then to nonmarine beds, illustrates the dramatic facies changes that characterize Upper Cretaceous rocks on the Plateau.

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