Baney_Robert_wk5_sedimentaryrock - Baney, Robert Hill,...

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Baney, Robert Hill, Heather Sci/245 5/8/2011
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Sedimentary rocks originally derive from igneous rocks that were once formed by things such as volcanoes. When igneous rocks break into fragments the broken pieces or clasts, of different sizes and shapes may form classtic sedimentary rock. Large boulder sized clasts are the size of a baseball or larger, the medium sized cobble clasts are about the size of an egg and pebble sized clasts are about the size of pea. These different types of clasts make up the gravel which forms new sedimentary rocks such as conglomerates and breccia. When the gravel is rounded and held together by fine material known as the matrix it indicates that the gravel was once eroded by water before the sediments were deposited; this compressed sedimentary rock is called a conglomerate. Breccia's are made up of more angular gravel held together by the matrix material which implies that the rocks were mechanically weathered from things like rock slides or faulting. Smaller clasts consist of sand, which is about the size pin’s head, silt, which is
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This note was uploaded on 08/18/2011 for the course BUSINESS 212 taught by Professor Fred during the Spring '11 term at University of Phoenix.

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Baney_Robert_wk5_sedimentaryrock - Baney, Robert Hill,...

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