Unit 11 Lab Student Response Sheet Spr 24 R1 sh
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STUDENT RESPONSES 1. What type of unconformity is displayed in the block diagram (hint – pay close attention to the
rock symbols)?
a. angular unconformity
b. nonconformity
c. disconformity
2. In the following block diagram, which of the following rock layers is the oldest?
a. A
b. B
c. C
d. D
3. For question #2, which geologic law did you use to come to the conclusion you made in the
previous question?
a. Law of Cross-Cutting
b. Law of Original Horizontality
c. Unconformities
d. Law of Superposition
4. In the following block diagram, which of the following rock layers is the youngest? a. A b. B c. C d. D 5. In the following block diagram, what type of unconformity is shown? a. angular unconformity b. nonconformity c. disconformity
6. For the following block diagram, what is the correct order of the labeled rock layers, starting
with the oldest?
a. A, B, C, D
b. C, B, D, A
c. A, D, B, C
d. C, B, A, D
e. D, C, A, B
Examine the block diagram below. Note that all rock layers in this diagram are sedimentary rock, except for the bottom layer, which is metamorphic. Using the geologic laws discussed earlier and following the examples shown in Figures 6 and 7, identify the geologic events that occurred in this area. Then place the following geologic events in the correct relative time sequence. A. Folding
B. Tilting
1
2
3
4
5
6
7
8
9
10
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C. Uplift and Erosion (Nonconformity)
D. Emplacement of metamorphic rock
E. Submergence and Deposition of sedimentary layers 3-6
F. Submergence and Deposition of sedimentary layers 1-2
G. Uplift and Erosion to current position
H. Submergence and Deposition of sedimentary layers 7-10.
I. Uplift and Erosion (Angular Unconformity)
J. Uplift and Erosion (Disconformity) – for this step, these beds are now folded, but were not at
the time of deposition, so it was a disconformity at time of deposition (with folding later)
7. Which of the following geologic events is fourth in the sequence?
a. A
b. B
c. C
d. D
e. E
f. F
g. G
h. H
i. I
j. J
8. Which of the following geologic events is fifth in the sequence?
a. A
b. B
c. C
d. D
e. E
f. F
g. G
h. H
i. I
j. J
9. Which of the following geologic events is seventh in the sequence?
a. A
b. B
c. C
d. D
e. E
f. F
g. G
h. H
i. I
j. J
10. Which of the following geologic events is tenth in the sequence?
a. A
b. B
c. C
d. D
e. E
f. F
g. G
h. H
i. I
j. J
11. How much of the parent isotope would be remaining after 3 half-lives have passed?
a. 3.13%
b. 1.56%
c. 12.5%
d. 0.39%
12. If a radiometric element has a half-life of 14,600 years, how old would a rock be that only
had 3.125% of the parent isotope remaining?
a. 2125 years
b. 4750 years
c. 73000 years d. 3125 years
13. Based on your graph above, approximately how much of the parent isotope would be
remaining after 5.5 half-lives?
a. 17%
b. 2%
c. 8%
d. 36%
14. Based on your graph above, approximately how many half-lives have passed when only 55%
of the parent isotope is remaining?
a. 0.85
b. 1.2
c. 10.8
d. 2.5
15.
Zircons have been found in a rock layer that a geologist would like to date. What dating
method would be most appropriate?
a. Carbon-14
b. Uranium
c. Potassium-Argon
16. The geologist determines that there is 64% of the parent remaining in the sample mentioned
in question 15. What is the age of the rock?
a. 1.59 billion years
b. 2.9 billion years
c. 2.6 billion years
d. 1.34 billion years
e. 4.6 million years
f. 5.8 million years
17.
An archeologist finds a bone in an area thought to be a former hunting camp. What dating
method would be most appropriate to use for the bone?
a. Carbon-14
b. Uranium
c. Potassium-Argon
18. The archeologist determines that there is 31.3% of the parent remaining in the bone sample.
How old is this sample?
a. 9,604 years
b. 14,798 years
c. 18,942 years
d. 11,697 years
e. 4.7 billion years
f. 9.2 million years
19.
Using Google Earth, go to 38 34 56.78N 107 44 46.65W and zoom to an eye altitude of
~7,500 feet. Closely examine the rocks here, noting the pink colored rock. These are pegmatite
dikes. You may recall that pegmatites are coarse-grained igneous rocks. Based on what you’ve
learned in this lab, what is the age of the pegmatites?
a. the pegmatites are older than the surrounding rock
b. the pegmatites are younger than the surrounding rock
c. the pegmatites are approximately the same age as the surrounding rock
20.
At Black Canyon of the Gunnison, you can observe one of the best exposures of pre-
Cambrian rocks in the world – 1.7 billion year old gneiss and schist. These old rocks are
overlain by sedimentary rocks that are Mesozoic and Cenozoic in age, so there is an approximate
370 million year gap here. What type of unconformity is this?
a. nonconformity
b. angular unconformity
c. disconformity
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