Rock_Identification_12 - provide information about the...

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Table 2.4 Sedimentary rock identification chart. Specimen Number Detrital or Chemical Texture (grain size) Composition Rock Name detrital rocks are based upon grain size, whereas com- position is used to subdivide the chemical rocks. 18. Place each of the sedimentary rocks supplied by your instructor on a numbered piece of paper. Then complete the sedimentary rock identification chart, Table 2.4, for each rock. Use the sedi- mentary rock identification key, Table 2.3, to determine each specimen's name. Sedimentary Rocks and Environments Sedimentary rocks are extremely important in the study of Earth's history. Particle size and the materials from which they are made often suggest something about the place, or environment, in which the rock formed. The fossils that often are found in a sedimentary rock also
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Unformatted text preview: provide information about the rock's history. Re-examine the sedimentary rocks and think of them as representing a "place" on Earth where the sediment was deposited. 19. Figure 2.9 is the rock sandstone which formed from sand. Where on Earth do you find sand, the primary material of sandstone, being deposited today? Figure 2.24 shows a few generalized environments (places) where sediment accumulates. Often, an envi-ronment is characterized by the type of sediment and life forms associated with it. 20. Use Figure 2.24 to name the environment(s) where, in the past, the sediment for the following sedimentary rocks may have been deposited. Sandstone (sand), Shale (mud), Limestone (coral and shells). What would the environments be for each?...
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