Layers of the Grand Canyon

Samuel Engbring haughty Canyon Paper March 7,2012 Rock Layers of the super acid Canyon The Grand Canyon is an amazing place to work through 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) quintet to six million years ago by erosion from the Colorado River and other water sources. On our celestial line of business 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 support 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 variant layers atomic number 18 a variety of algaes and strolomatites. Stromatotites ar the oldest fossils to be found in the Gr and Canyon and as well occur in Chaur stratum that is located above the Unkar. The Chaur assort 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 fit out 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 snip. The most common fossils in these layers are trilobites and brachiopods. At th! e time of these 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 illuminate forty-five million years old. This layer is comprised medium and form grained sandstone with ripple marks in it. These ripple marks tell that a shallow tidal environment with low source formed it....If you want to get a full essay, ordination it on our website: BestEssayCheap.com

If you want to get a full essay, visit our page: cheap essay