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Download 2.3.4a Clastic Sedimentary Rock Classification EQ
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F792 2.3.4a Clastic Sed. Identification: Worksheet (a) (i) What are the sizes and terms used to define clastic sedimentary rocks? Give one example of a sedimentary rock that shows each grain size. 2 to 0.0625mm sizes Comp. /23 clay Conglomerate rock examples (4) (ii) Compare the energy conditions under which fine and course grains are deposited ................................................................................................................................................. ............................................................................................................................................ (1) (b) (i) Define the term sorting. ................................................................................................................................................. ............................................................................................................................................ (1) (ii) Draw two sketches in the spaces below to show a well sorted sediment and a poorly sorted sediment. (2) Well sorted (c) (i) Poorly sorted How does grain shape vary with the degree of transportation? ................................................................................................................................................. ............................................................................................................................................ (1) (ii) Draw a diagram below to show the shape of the grains in a wind blown desert sand and in a glacial breccia. Wind blow desert sand 5/7/2017 D:\840989491.doc Glacial Breccia (2) (d) (i) What does the term laminated mean? ................................................................................................................................................. ............................................................................................................................................ (1) (ii) What rock type often shows laminations? ............................................................................................................................................ (1) (iii) What grain size is the rock mentioned above and what minerals does it contain? ................................................................................................................................................. ............................................................................................................................................ (2) (e) (i) term? Desert sandstones are usually mineralogically mature. What is meant by this ................................................................................................................................................. ............................................................................................................................................ (1) (ii) Describe the mineral content and appearance of a desert sandstone? ................................................................................................................................................. ................................................................................................................................................. ............................................................................................................................................ (3) (f) Sandstones can show many different features. Complete the table below to show the distinguishing features of the following sandstones. Limestone Features Greywacke Orthoquartzite Desert Sandstone Arkose (4) 5/7/2017 D:\840989491.doc
