SEDIMENT_ROCKS

SEDIMENT_ROCKS - SEDIMENTS& SEDIMENTARYROCKS

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SEDIMENTARY ROCKS
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CLASTIC or DETRITAL SEDIMENTARY ROCKS In the classification of clastic or detrital  sedimentary rocks, textural criteria such as grain  size or grain shape are of particular importance. The grain size of the  clast  determines the rock’s  root name.
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Both rocks below have clast sizes that are larger than 2  mm  (gravel  size).  The rock on the left has  rounded   clasts and is called conglomerate .   The rock on the right has  angular  clasts and is classified  as breccia .
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Detrital sedimentary rocks with with clasts of grain sizes  between 1/16 mm and 2 mm are sandstones .
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Clast sizes between  1/256 and 1/16 mm are  called  silt.   The rock to  the left is a siltstone . Shales  or claystones   contain the smallest  particles  (clay) . Shales are particularly  suited for the preservation  of fossils.
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CHEMICAL SEDIMENTARY ROCKS For the classification of chemical sedimentary rocks  the chemical composition is even more important than  grain size of particles present.
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All rocks shown consist of calcium carbonate (calcite). The left image shows shell fragments that are larger than 2mm and 
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This note was uploaded on 02/25/2012 for the course EARTH 2 taught by Professor Thomas during the Summer '11 term at UCSB.

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SEDIMENT_ROCKS - SEDIMENTS& SEDIMENTARYROCKS

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