By Fred Peterson, Christine Turner-Peterson
About The Product
Published by way of the yank Geophysical Union as a part of the Field journey Guidebooks Series.
The Colorado Plateau is a widely increased area within the southern a part of the Western inside of the U.S. that has particularly positive exposures of higher Paleozoic, Mesozoic, and Cenozoic rocks. the standard of exposures is a manufactured from nearby uplift within the heart and overdue Tertiary that brought on speedy erosion and deep canyon incision in a semi-arid to arid weather. The constitution of the Plateau includes huge basins, uplifts, and structures in the community bordered by way of monoclines. even though increased in Tertiary time, the Plateau quarter was once a different crustal block by way of the start of Mesozoic time while it was once mostly surrounded by way of tectonically distinctive areas. higher Paleozoic to Cenozoic strata include the list of marine and continental sedimentologic procedures advanced in various levels through the interaction among sea-level adjustments and tectonism, either in the Plateau zone and in bordering areas. the sphere day trip will provide a chance to work out the striking geologic surroundings of the Colorado Plateau and to debate the local sedimentologic and structural heritage.
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Extra info for Geology of the Colorado Plateau: Grand Junction to Denver, Colorado June 30-July 7, 1989
Riggs. The skeleton was completed with bones from other localities and is on display at the Field Museum of Natural History in Chicago (Chenoweth, 1987). Many other Morrison outcrops in this vicinity have yielded well-preserved dinosaur bones. The Morrison consists of a thin lacustrine mudstone unit at the base (Tidwell Member) overlain by a thick fluvial sandstone and overbank mudstone unit (Salt Wash Member) that, in turn, is overlainby athick, red and white banded, lacustrine mudstone unit named the Brushy Basin Member.
Newspaper Rock is an outstanding example of primitive graffiti by the ancient Indians (Figure 23). The figures or geometric designs are called petroglyphs, which are chipped or pecked into the rock with a hard, pointed object, probably a piece of chert or quartzite. This is in contrast to pictographs, which depict similar figures or designs but are painted on rock surfaces. The petroglyphs at Newspaper Rock are on a wall of Wingate Sandstone coated with a thick patina of desert varnish. It was chipped away by the Indians to reveal lighter hues offresh sandstone beneath the natural staining, so that the figures would stand out with a marked color contrast.
From Paleozoic to Early Jurassic time, the drainage was toward the west but from the Late Jurassic through the Cretaceous it was toward the east. Colorado National Monument to Professor Valley. After retracing our route to Fruita, we follow Interstate 70 west and pass low hills and scattered outcrops of Morrison, Burro Canyon, Dakota, and Mancos. Just beyond Rabbit Valley exit the highway climbs through these fonnations and enters a broad valley in the Mancos Shale at the Utah state line. The conspicuous peaks to the southwest are the La Sal Mountains composed of Oligocene intrusive bodies.
Geology of the Colorado Plateau: Grand Junction to Denver, Colorado June 30-July 7, 1989 by Fred Peterson, Christine Turner-Peterson