GEOL101 Lab 8

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Geology

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Feb 20, 2024

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GEOL 101 Dynamics of the Earth Lily Razzano Lab 8 Section 3 GEOL101 Question 1. Put all 8 geologic events in Figure 10 in the proper sequence from oldest to youngest in the table provided. If an unconformity is present indicate what type, angular unconformity, disconformity, or nonconformity. Figure 10: The tilting beds located below unit B indicate an erosional surface or unconformity is present. These tilting beds were originally deposited horizontally, they are tilting now because of a folding event. Youngest 8. Earth’s Surface 7. N 6. B 5. L 4. T 3. P 2. A Oldest 8. J Question 2. What type of unconformity is L? How do you know? L is an angular conformity, it makes an angle with the underlying beds Question 3. Which rock unit is older J or T? How do you know? J is older than T, because the beds dip towards the left therefore T is younger Question 4. Put all 14 geologic events depicted in Figure 11 in the proper sequence from oldest to youngest in the table below. Use the event bank below to complete the table; each event will only be used once. Figure 11: Granite F is an igneous intrusion with a dike extending towardsthe surface. Notice that all the beds that granite F cuts are tilted, indicating that the folding event that tilted these beds is most likely due to the intrusion of granite F. Because of this relationship the folding event must be younger than the intrusion of granite F. Event Bank: Deposit H, Deposit J, Deposit C, Deposit B, angular unconformity
Deposit E, Deposit D, Deposit K, Granite F, disconformity Deposit I, Deposit G, Deposit A , folding Youngest 14. Deposit H 10. Deposit C 5. Deposit B 13. Deposit D 9. Angular unconformity 4. Deposit A 12. Deposit E 8. Folding 3. Deposit G 11. Disconformity 7. Granite F 2. Deposit I 6. Deposit K Oldest 1. Deposit J Refer to Figure 12 to answer the following questions. Question 5. Are there inclusions of granite in unit A? Which is younger granite or deposition of unit A - H? Granite is younger than deposition of unit A-H and there would be no inclusions . Question 6. Based on cross cutting relationships which is older, Fault X or granite? Here we are using cross cutting relationship and we conclude that Fault X is younger than the granite it means granite is older Question 7. Based on cross cutting relationships which is older, Fault Y or Fault X? By using cross cutting relationships, we can understand that Fault X is older than fault Y . Question 8. What type of fault is Fault Y? Fault Y represents normal fault Question 9. What type of fault is Fault X? Fault X represent reverse fault Figure 12: There are no inclusions of granite in unit A and units A – H are all folded the same, indicating the granite intruded into units A – H after they were deposited and most likely caused the folding event. The basalt cross cuts all other geologic features and therefore must be the youngest event. Event Bank: Deposit A - H , Deposit J , Granite , Angular Unconformity Fault X , Basalt , Folding , Deposit K Deposit I , Deposit L , Fault Y Question 10. Put all 11 geologic events depicted in figure 12 in the proper sequence from oldest to youngest in the table provided. Use the event bank to complete the table, each event will only be used once and all the listed events should be used.
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