6 21 FIGURE Q23 23. Analyze the diagram of FIGURE Q23 and choose the correct sta

Question

6 21 FIGURE Q23 23. Analyze the diagram of FIGURE Q23 and choose the correct statement. A. Layer E is older than fault FF'. B. Layer B is older than layer D. C. Layer C is older than unconformity AA'. D. Unconformity AA is older than fault FF'.. 24. An unconformity is always: A. Younger than the rocks beneath it and older than the rocks above it. B. Older than the rocks beneath it and as old as the rocks above it. C. Older than the rocks beneath it and younger than the rocks above it. D. Older than the rocks beneath and above it 25. An unconformity represents a surface on which A Faulting has been followed by erosion B Deposition has been followed by faulting. c. Subsidence has been followed by folding. D. Erosion has been followed by deposition.

Explanation / Answer

23. Option A is correct as according to the principle of cross cutting relationships, any feature that cuts into a formation is always younger than the formation and hence layer E is older than fault FF’.

24. Again option A is correct because as per the principle of original horizontality, in an undisturbed strata any formation or feature lying above some formation is alway younger that the formation. And that feature or formation is always older than the formation lying above it.

25. An unconformity represents a period when there is no net deposition and hence it can be represented as a time gap in deposition. This time gap can be due to erosion as due to erosion there would be no net deposition and hence an unconformity represents that erosion has been followed by deposition. Therefore option D is correct.

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