Rocks and Dates Geology Analysis

1038 Words 5 Pages
The Grand Canyon is a wonderful place to gain a sense of how old the earth really is because of the ability to date the layers of rock in the canyon. The Rocks exposed in Grand Canyon are truly ancient, ranging from 1840 million years old or 1.84 billion years old (to 270 million years of age. (Beus, and Morales, 2003). While the Grand Canyon is not old in comparison to much of the earth, it is considered young earth because it was slivered by an ie in the last six million years. This gives the rocks in the Canyon Ice age fossils and new deposits, in the grand scheme of things. Some of the younger deposits in the Canyon are only a thousand years old and are the result of lava that began to come into the geographic. It is the walls of the …show more content…
The oldest recorded rock in the Grand Canyon is Elves Chasm Gneiss. It is speculated to have formed in 1840 m.y. and is older than any other rock found in the Grand Canyon. The specific origin of the Elves Chasm formation is unclear, but researchers believe that it may have formed from fragments of continental crust (Dehler, et al, 1999). It is said that most of the rocks in the canyon formed between 1750 and 1680 Ma. It is most likely that the area of the Grand Canyon was volcanic and the rest of the canyons deep crevasses were created by erosion from water. This also shows that the canyon area was at a peak with metamorphism and igneous interference.
Vishnu Schist is common in the Grand Canyon along with three other kinds of Schist. The estimated time that this schist formed was between 1700 and 1600 Ma. Each of the schist are formed from different rock types. The most well-known, Vishnu Schist was formed from metamorphosed sedimentary rock. The other schist Brahma and Rama Schist’s are formed from metamorphosed volcanic rock. (Dehler, et al, 1999). The schist rocks, which are metamorphic are actually categorized as Paleoproterozoic supracrustal rocks. These types of rock are found in the Upper Granite Gorge. In their article, Tectonic evolution of Paleoproterozoic rocks in the Grand Canyon: Insights into middle-crustal process, Bradley Ilg, Karl Karlstrom, David Hawkins,
Open Document