A geologist has sketched two different sedimentary rock columnis that she has be

Question

A geologist has sketched two different sedimentary rock columnis that she has been studying. There are several inferences that can be made about the layers of rocks in the two columns. Fill in the blank with the letter that best matches the description Index Fossils 100 my old O 400 my old 600 my old A. Layer W B. Layer X C. Layer Z D. Layer S Matching 9. is the same age as layer R (1 point) 10. is the same age as LayerQ (1 point) 11. is the oldest layer (1 point) 12. appears to have existed in the past and eroded away ( point)

Explanation / Answer

9. Answer: C. Layer Z Explanation: Since in the layers Z and R same fossil is deposited, the layers are of same age. 10. Answer: A. Layer W Explanation: Since in the layers Q and W same fossil is deposited, the layers are of same age. 11.Answer: D. Layer S Explanation: The known oldest rock in the figure is R and Z as per the fossil ages givven. But the layer S is below R and the lower most layer is the oldest layer accodring to the principle of originical horizontality. 12.Answer: B Layer X Explanation: BEcause the fossil of age 400 mya is missing the second cross section. Therefore, X and Y layers might have eroded and carried away in time.

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