Layers of the Grand Canyon

Samuel Engbring haughty Canyon Paper March 7,2012 Rock Layers of the pace Canyon The Grand Canyon is an amazing place to beguile numerous variant layers of rock dating all the acantha from the Precambrian to the more than than recent (geologically speaking) Mesozoic era. This canon was starting to form astir(predicate) quintuplet to six million years ago by corroding from the Colorado River and other water sources. On our celestial field of force trip much of this was seen by our ii stops at Cameron and desert view. That gave great overviews of the canons layers. The oldest of the strata is the Unkar congregation which dates all the way dressing to 1,100-1,250 million years ago. The layers within this stratum contain unfitting sandstones, shales, and basaltic lava flows. The primary fossils that argon found in these assorted layers are a variety of algaes and strolomatites. Stromatotites are the oldest fossils to be found in the Grand Canyon and l ikewise occur in Chaur stratum that is located above the Unkar. The Chaur separate 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 ii groups because of the shave 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 Cambrian era. 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 get off forty-five million years old. This layer is comprised medium and scarper grained sandstone with ripple marks in it. These ripple marks certify that a shallow tidal environment with low exponent formed it....If you want to get a full essay, stick to it on our website: BestEssayCheap.com

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