The Queen's Throne - Utah
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"Sedimentary rocks are those rocks which form at or near the earth's surface at relatively low temperatures and pressures primarily by either:
"Sedimentary rocks cover some 80% of the Earth's crust. All our knowledge of stratigraphy, and the bulk of our knowledge of structural geology, are based on studies of sedimentary rocks." [pages 1-6]
"James Hutton (1727 - 1797), the eminent 18th century gentleman farmer and founder of modern geoscience, authored the concept of the rock cycle, which depicts the interrelationships between igneous, sedimentary, and metamorphic rocks. The upper part of the earth (mantle, crust and surface) can be envisioned as a giant recycling machine; matter that makes up rocks is neither created nor destroyed, but is redistributed and transformed from one rock type to another. PETROLOGY, the study of rocks and their origins, is essentially the formal process by which we resolve the interrelationships expressed in the rock cycle."
How was it formed? ...... "The truth is that no one knows for sure though there are some pretty good guesses. The chances are that a number of processes combined to create the views that you see in todays Grand Canyon. The most powerful force to have an impact on the Grand Canyon is erosion, primarily by water (and ice) and second by wind. Other forces that contributed to the Canyon's formation are the course of the Colorado River itself, vulcanism, continental drift and slight variations in the earths orbit which in turn causes variations in seasons and climate."
Learning about geology from a computer screen is only half as fun as enjoying it in the field!
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Copyright by John C. Butler, July 29, 1995