1 Answers to Chapter 6 End of Chapter Questions 1. Quartz is a common mineral in sandstone. Under certain circumstances, feldspar is common in sandstone, even though it normally weathers rapidly to clay. What conditions of climate, weathering rate, and erosion rate could lead to a feldspar rich sandstone? The combination of a) a cold, dry climate (which gives a slow chemical weathering rate); b) a rapid mechanical weathering rate and; and c) a rapid erosion rate all combine to give conditions that would produce feldspar-rich sandstones. 2. Describe with sketches how wet mud compacts before it becomes a shale Your sketch should look something like Figure 6.15 on page 149. 3. What do mud cracks tell about the environment of deposition of a sedimentary rock? Mud cracks tell you that an originally wet environment was exposed to air and dried up. See page 159-160 for details. 4. How does a graded bed form? Graded beds form as sediment is deposited by a gradually slowing current. More details can be found on pages 157-159 of
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