GEOLOGY 540 - Which of the following rock layers is oldest

Question # 00582011 Posted By: dr.tony Updated on: 09/02/2017 04:46 AM Due on: 09/02/2017
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Introductory Geology Introduction to physical geology

1.10 Student Responses

1. In Figure 1.8, which of the following rock layers is oldest?

a. A b. B c. C

2. Which Geologic Law did you use to come to the conclusion you made in the

previous question?

a. The Law of Superposition b. The Law of Cross-Cutting

c. The Law of Original Horizontality d. Unconformities

3. In Figure 1.9, which of the following geologic structures is youngest?

a. A b. B c. C

4. Which Geologic Law did you use to come to the conclusion you made in the

previous question?

a. The Law of Superposition b. The Law of Cross-Cutting

c. The Law of Original Horizontality d. Unconformities

5. Examine unconformities 1 and 2 indicated in Figure 1.9. Which of the following

statements about them is true?

a. The older unconformity is a Nonconformity, while the younger is an Angular Unconformity.

b. The older unconformity is a Disconformity, while the younger is a Nonconformity.

c. The older unconformity is a Nonconformity, while the younger is a Disconformity.

d. The older unconformity is an Angular Unconformity, while the younger is a Disconformity.

6. Examine the Unconformity shown in Figure 1.10. What type of unconformity

is this?

a. Angular Unconformity b. Nonconformity c. Disconformity

Introductory Geology Introduction to physical geology

7. Which of the above geologic events is the second in the sequence?

a. A b. B c. C d. D

e. E f. F g. G h. H

8. Which of the above geologic events is the fifth in the sequence?

a. A b. B c. C d. D

e. E f. F g. G h. H

9. Which of the above geologic events is the seventh in the sequence?

a. A b. B c. C d. D

e. E f. F g. G h. H

10. Based on the assemblage of organisms (A-I) in this sample, what is the age of

this rock?

a. Economy b. Southgate c. McMicken d. Mt. Hope

e. Fairmount f. Bellevue g. Corryville h. Mt. Auburn

11. Which organism was the most useful in coming to this conclusion (which is the

best index fossil)?

a. Isotelus b. Zygospira c. Cyclonema d. Vinlandostrophia

e. Parvohallopora f. Cincinnetina g. Streptaster h. Ambonychia

12. Which organism was the least useful in coming to this conclusion (which is the

worst index fossil)?

a. Isotelus b. Zygospira c. Cyclonema d. Vinlandostrophia

e. Parvohallopora f. Cincinnetina g. Streptaster h. Ambonychia

13. How much of the parent isotope would be remaining after 7 half-lives have passed?

a. 6.25% b. 1.56% c. 0.78% d. 0.39%

Introductory Geology Introduction to physical geology

14. If a radiometric element has a half-life of 425 years, how old would a rock be

that only had 3.125% of the parent isotope remaining?

a. 2125 years b. 1700 years c. 2550 years d. 3400 years

15. Based on your graph above, approximately how much of the parent isotope

would be remaining after 3.5 half-lives?

a. 16% b. 12% c. 4% d. 8%

16. Based on your graph above, approximately how many half-lives have passed

when only 35% of the parent isotope is remaining?

a. 0.75 b. 1.5 c. 2.1 d. 2.5

17. An Archeologist finds some cotton cloth at a burial site and wants to determine

the age of the remains. Which isotopic system should they use?

a. Carbon-14 b. Uranium c.Potassium-Argon

18. The Archeologist determines that there is 16.7% of the parent isotope remaining

in the cloth sample. How old is the burial site? Hint: you can find the length of

the half-life in the reading above.

a. 13,559 years b. 14,798 years c. 16,743 years

d. 1.66 billion years e. 1.81 billion years f. 2.05 billion

19. A geologist is trying to date a sequence of sedimentary rocks with abundant

fossils and sandstones. Within the sequence is a distinctive clay layer that

under closer inspection is fine-grained volcanic ash. Which of the following is

the best way to obtain an absolute date for the sequence of rocks?

a. Carbon date the fossils b. Potassium-Argon date the sands

c. Uranium date the Zircons in the ash d. Identify the index fossils

20. The geologist determines there is 78.3% of the parent remaining in the sample

that they examine. How old is the sequence of rocks? Hint: you can find the

length of the half-life in the reading above.

a. 187.5 million years b. 247.8 million years c. 390.7 million years

d. 2.504 billion years e. 1.588 billion years f. 1.202 billion years

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