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Learning GOAL You will examine photographs of three types of loose sediment, assess grain size, sorting, roundness, and composition/type, and then infer the sort of environment in which the sediment might have originated. A Complete parts 1 through 6 for each sample in Fig. A6.5.1. Refer to Figs. 6.15, 6.16, and 6.27 as needed. Sample A Sample B Sample C Figure A6.5.1 10mm 1. Grain size range in mm: 2. Percent of each Wentworth size class clay: 3. Grain sorting (circle) poor moderate 4. Grain roundness (circle) angular 5. Sediment composition (circle) precipitated 6. Describe how and in what environment this sediment might have formed. 3. Grain sorting (circle) poor well 1. Grain size range in manc 2. Percent of each Wentworth size class clay: 4. Grain roundness (circle) angular submund S granel 3. Grain sorting (circler poor 4. Grain roundness (circle angular subround 5. Sediment composition (circle) precipitated 6. Describe how and in what environment this sediment might have formed. S gravet 1. Grain size range in mm: 2. Percent of each Wentworth size clas clay: well 5 grad well rounded 5. Sediment composition (circle) precipitated 6. Describe how and in what environment this sediment might have formed. B REFLECT & DISCUSS Imagine that these sediments are rocks. Which of the samples do you think would be the least diagnostic of a specific ancient environment? Why? 175
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