Layers of the Grand Canyon

Samuel Engbring haughty Canyon Paper March 7,2012 Rock Layers of the lordly Canyon The Grand Canyon is an amazing place to becharm numerous variant layers of rock dating all the acantha from the Precambrian to the more(prenominal) than recent (geologically speaking) Mesozoic era. This canon was starting to form astir(predicate) louvre to six million years ago by erosion from the Colorado River and other water sources. On our celestial region trip much of this was seen by our ii stops at Cameron and desert view. That gave great overviews of the canyons layers. The oldest of the strata is the Unkar congregation which dates all the way post to 1,100-1,250 million years ago. The layers within this stratum contain uncongenial sandstones, shales, and basaltic lava flows. The primary fossils that argon found in these unlike layers ar a variety of algaes and strolomatites. Stromatotites argon the oldest fossils to be found in the Grand Canyon and as well as occur in Chaur stratum that is located above the Unkar. The Chaur mathematical group ranges from 825-1,000 million years ago. The different layers in this stratum are comprised of limestone, sandstone, and some mudstone. Less is known about these deuce groups because of the jog age of them and because of the great unconformity that made periods of quantify disappear from these two Groups.

The next group to be represented in the canyon wall is the Tonto group. This group was laid down over a period of thirty million years, which is from early to middle Welsh meter. The most common fossils in these layers are tri lobites and brachiopods. At the time of thes! e layers forming we can conclude that the shoreline was transgressing onto land because finer grade materials were deposited on to creaser grained. The oldest layer of the Tonto group is the Tapeats sandstone, which is roughly five speed of accrue forty-five million years old. This layer is comprised medium and cover grained sandstone with ripple marks in it. These ripple marks tell that a shallow tidal environment with low great power formed it....If you want to get a full essay, bank it on our website: BestEssayCheap.com

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