Question

Question 38 4 pts Report the order of geologic events from OLDEST (#1) TO YOUNGEST (#14) (there are 14 events total) АН - F [Choose] [Choose] [Choose] [Choose] Choose)

Answer 1

Answer: (Youngest at the top. Oldest is formed first and is at the bottom)

13. Erosion of top most layer.

13. The hanging wall to the right of the fault plane moves down.

12. -— Fault—

11. J- Youngest Strata

10. I

9. H

8. —-Unconformity— Erosion

7. G- Igneous Intrusion

6. F

5. E

4. D

3. C

2. B

1. A- Oldest

We use the law of superposition that states that in a sequence of strata, the older rock layer will be at the bottom and will be superimposed by the younger strata on top. The law of cross-cutting states that if an event in a sequence overlaps with another, the overlapped feature was formed first.

• By using these laws, we can observe that layer A was deposited first followed by layers B, C, D, E and F.
• Then an igneous body G intruded the sequence after which there was a period of erosion (unconformity).
• Then layers H, I and J were deposited.
• Then a fault affected the entire sequence. The hanging wall (to the right_ moved down relative to the footwall. This happens in Normal Fault where crustal lengthening takes place.
• Then the top layer J was eroded.