Layers of the Grand Canyon

Samuel Engbring haughty Canyon Paper March 7,2012 Rock Layers of the noble-minded Canyon The Grand Canyon is an amazing place to attain numerous variant layers of rock dating all the acantha from the Precambrian to the to a greater extent than recent (geologically speaking) Mesozoic era. This canon was starting to form astir(predicate) fin to six million years ago by wearing away from the Colorado River and other water sources. On our celestial scope 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 unfitting sandstones, shales, and basaltic lava flows. The primary fossils that argon found in these distinguishable layers ar a variety of algaes and strolomatites. Stromatotites ar the oldest fossils to be found in the Grand Canyon and similarly occur in Chaur stratum that is located above the Unkar. The Chaur radical 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 cardinal groups because of the tailor 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 cadence. The most common fossils in these layers are trilobites and br achiopods. At the time of these layers formi! ng 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 by forty-five million years old. This layer is comprised medium and lean grained sandstone with ripple marks in it. These ripple marks try out that a shallow tidal environment with low spot formed it....If you want to get a full essay, hostel it on our website: BestEssayCheap.com

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