By Robert Fillmore
ISBN-10: 0874806526
ISBN-13: 9780874806526
This distinctive interpretive advisor explains the forces that created Utah's unforgettable surroundings, whereas supplying highway logs of highways and significant backroads during the Grand Staircase of the Colorado Plateau.Where in Utah are you able to discover a fossilized ant hill that's no less than fifty million years outdated? have you learnt the positioning of an historical seashore that disappeared in addition to the dinosaurs that strolled it? discover within the Geology of the Parks, Monuments, and Wildlands of Southern Utah.This attention-grabbing and authoritative advisor belongs at the dashboard or within the backpack of each customer to southern Utah or scholar of its ordinary background. greater than sixty illustrations and approximately 3 dozen photos accompany transparent reasons of the brilliant geologic positive aspects of this panorama, together with Capitol Reef, Bryce Canyon, and Zion nationwide Parks, in addition to the Grand Staircase-Escalante Monument.Section I of the amount surveys chronologically the origins of the formations and structural beneficial properties and the geologic strategies that experience formed the Colorado Plateau. part II offers highway logs with mile-by-mile geologic descriptions of key sections of road traversing this area.This exact interpretive consultant turns any windshield right into a window of chance for figuring out the forces that created Utah’s unforgettable scenery—whether or not it's a panoramic landscape or a stunning array of fins and fractures, pillars and pedestals, or cliffs and chasms.
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Additional info for The geology of the parks, monuments, and wildlands of southern Utah
Sample text
Nor would most people want to, considering the assortment of dinosaur bones recovered from these Jurassic rocks. Instead, geologists gather all the information available from the rock record, including composition, textures, and structures in the rock. These scraps of information are then pieced together to produce the clearest, most accurate picture possible. From this partially reconstructed puzzle, we must interpret the physical setting for these long-ago times. Interpretations are backed up by observations of modern geologic processes and their products.
A special type of reverse fault is the thrust fault, which forms when the angle of the fault plane is less than 30°, causing one side of the fault to be thrust up and over the adjacent block (fig. 4C). 4. Thrust faults typically form in layered sedimentary rocks during extreme horizontal compressional stress. Page 12 Compressional stress and resulting thrust faults and folds have been the dominant mode of mountain-building in western North America over much of its geologic history. However, the stress regime has shifted in the past 30 to 20 million years to a dominantly extensional regime characterized by normal faults.
Relative age determination is based on the vertical relations between various rock units. Put simply, a sedimentary or volcanic rock unit is younger than the rocks below it, but older than those on top of it. As rocks were examined in ever greater detail, certain fossils were recognized as characteristic of specific units and could be taken to represent a discrete period. These observations allowed sedimentary sequences containing these fossils but separated by large distances to be correlated with respect to time; widely separated strata with the same fossils could be assumed to be the same age.
The geology of the parks, monuments, and wildlands of southern Utah by Robert Fillmore
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