Quiz_ Geologic Time LAB
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School
Tarrant County College, Fort Worth *
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Course
1403
Subject
Geology
Date
Dec 6, 2023
Type
Pages
17
Uploaded by CaptainNightingale2524
Geologic Time LAB
Due
Oct 23 at 11:59pm
Points
34
Questions
21
Time Limit
None
Instructions
Attempt History
Attempt
Time
Score
LATEST
Attempt 1
39 minutes
34 out of 34
Score for this quiz: 34
out of 34
Submitted Oct 2 at 9:35am
This attempt took 39 minutes.
This exercise covers geologic time. You will need to use the information contained in chapter 7 of the text
book. Also chapter 1 in the lab manual will help. This exercises consists of multiple choice and text entry
questions. The total points of this exercise is 34 points. Some points must be graded/awarded manually;
Canvas will auto-grade the remainder upon completion. Points will be given for correct answers and
explanations; partial credit may be awarded as appropriate. This exercise does not have a time limit. You
may only submit this exercise [1] time.
1 / 1 pts
Question 1
Select the correct principle as per the following definition.
If you come across sedimentary rock layers that are not horizontal (flat), you
can assume those layers have been folded or tilted because sedimentary
rocks form in horizontal layers.
Principle of Original Horizontality Correct!
Correct!
Principle of Superposition Principle of Original Lateral Continuity
Principle of Cross-Cutting Relationships Principle of Inclusions 1 / 1 pts
Question 2
Select the correct principle as per the following definition.
A geologic feature (such as a bed, fault, unconformity, etc.) is younger than
the feature it cuts across. For example, in order for a fault to divide a
geologic layer, the layer had to be there first and is older than the fault that
divided it.
Principle of Original Horizontality Principle of Superposition Principle of Original Lateral Continuity Principle of Cross-Cutting Relationships Correct!
Correct!
Principle of Inclusions 1 / 1 pts
Question 3
Select the correct principle as per the following definition.
Sedimentary rocks are deposited laterally in all directions in a particular
area, until the sediment type changes and the layer thins out to nothing (it
gets thinner and thinner until it is essentially gone). If a sedimentary layer
suddenly stops, something has cut the layer off or the layer was eroded
away at that point. I.e., you can assume that the sedimentary layers you
see on one side of the Grand Canyon are the exact same sedimentary
layers on the other side.
Principle of Original Horizontality Principle of Superposition Principle of Original Lateral Continuity Correct!
Correct!
Principle of Cross-Cutting Relationships Principle of Inclusions 1 / 1 pts
Question 4
Select the correct principle as per the following definition.
An inclusion in a rock is older than the rock containing it. For example, if
you find a piece of granite inside a layer of sandstone, the granite is older
than the sandstone.
Principle of Original Horizontality Principle of Superposition Principle of Original Lateral Continuity Principle of Cross-Cutting Relationships Principle of Inclusions Correct!
Correct!
1 / 1 pts
Question 5
Select the correct principle as per the following definition.
When you find sedimentary rocks in horizontal, flat layers, you can assume
that the oldest layer is on the bottom and the youngest layer is at the top.
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Principle of Original Horizontality Principle of Superposition Correct!
Correct!
Principle of Original Lateral Continuity Principle of Cross-Cutting Relationships Principle of Inclusions 1 / 1 pts
Question 6
Select the principle that allows the following statement to be correct.
In this figure, fault J is younger than layer A.
Principle of Original Horizontality Principle of Superposition Principle of Original Lateral Continuity
Principle of Cross-Cutting Relationships Correct!
Correct!
Principle of Inclusions 1 / 1 pts
Question 7
Select the principle that allows the following statement to be correct.
In this figure, the rock layers have undergone a folding event.
Principle of Original Horizontality Correct!
Correct!
Principle of Superposition Principle of Original Lateral Continuity Principle of Cross-Cutting Relationships Principle of Inclusions 1 / 1 pts
Question 8
Select the principle that allows the following statement to be correct.
In this figure, the dark gray-black rock in the center (gabbro) is older than the
surrounding white and black rock (diorite).
Principle of Original Horizontality Principle of Superposition Principle of Original Lateral Continuity Principle of Cross-Cutting Relationships Principle of Inclusions Correct!
Correct!
1 / 1 pts
Question 9
Select the principle that allows the following statement to be correct.
In this figure, labels A through E represent the same layers on both sides
and were once connected.
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Principle of Original Horizontality Principle of Superposition Principle of Original Lateral Continuity Correct!
Correct!
Principle of Cross-Cutting Relationships Principle of Inclusions 1 / 1 pts
Question 10
Select the principle that allows the following statement to be correct.
In this figure, layer E is older than layer B.
Principle of Original Horizontality Principle of Superposition Correct!
Correct!
Principle of Original Lateral Continuity Principle of Cross-Cutting Relationships Principle of Inclusions 1 / 1 pts
Question 11
Select the principle that allows the following statement to be correct.
In this image, these layers have been tilted (almost 90 degrees!) after
deposition.
Principle of Original Horizontality Correct!
Correct!
Principle of Superposition
Principle of Original Lateral Continuity Principle of Cross-Cutting Relationships Principle of Inclusions 1 / 1 pts
Question 12
Select the principle that allows the following statement to be correct.
In this figure, the sandstone is older than the granite. Principle of Original Horizontality Principle of Superposition Principle of Original Lateral Continuity Principle of Cross-Cutting Relationships Principle of Inclusions Correct!
Correct!
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1 / 1 pts
Question 13
Select the principle that allows the following statement to be correct.
In this image, both of these towers of rock are the same rock layers and
were once connected.
Principle of Original Horizontality Principle of Superposition Principle of Original Lateral Continuity Correct!
Correct!
Principle of Cross-Cutting Relationships Principle of Inclusions 1 / 1 pts
Question 14
Select the correct unconformity as per the following definition.
An erosional surface or a place where deposition of sediments did not occur,
which separates sedimentary rocks from older intrusive igneous or
metamorphic rocks is a(n):
Angular unconformity Disconformity Nonconformity Correct!
Correct!
1 / 1 pts
Question 15
Select the correct unconformity as per the following definition.
An erosional surface separating rocks that do not have parallel layers
(beds); the layers of rock meet at an angle along a definitive line is a(n):
Angular unconformity Correct!
Correct!
Disconformity Nonconformity 1 / 1 pts
Question 16
Select the correct unconformity as per the following definition.
An erosional surface or a place where deposition of sediments did not occur,
which separates rocks that have parallel layers is a(n):
Angular unconformity Disconformity Correct!
Correct!
Nonconformity
1 / 1 pts
Question 17
Select the unconformity shown image below.
Angular unconformity Disconformity Correct!
Correct!
Nonconformity 1 / 1 pts
Question 18
Select the unconformity shown image below.
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Angular unconformity Correct!
Correct!
Disconformity Nonconformity 1 / 1 pts
Question 19
Select the unconformity shown image below.
Angular unconformity Disconformity Nonconformity Correct!
Correct!
9 / 9 pts
Question 20
The image below depicts the geologic age ranges for select fossils. Use this
image to answer the following.
Answer 1:
Answer 2:
Answer 3:
If you found an ammonite fossil in a bed of rocks, you know those rocks are
somewhere between Devonain and [ Select ]
in age.
If you found a bed of rocks containing buzz-saw shark fossils, you know that
bed of rocks is [ Select ]
in age. Other fossils that you
might find in this rock include [ Select ]
and
[ Select ]
.
If you found a bed of rocks with armored fish fossils, giant sea scorpions,
and trilobites, the age range of that rock bed is from the
[ Select ]
to the [ Select ]
.
Of the animals in the figure, [ Select ]
is the best
marker of a rock bed age because it existed for the
[ Select ]
amount of time.
Devonain Correct!
Correct!
Cretaceous Correct!
Correct!
Answer 4:
Answer 5:
Answer 6:
Answer 7:
Answer 8:
Answer 9:
Permian Correct!
Correct!
ammonites Correct!
Correct!
lobe-finned fishes Correct!
Correct!
Silurian Correct!
Correct!
Devonian Correct!
Correct!
Buzz-saw sharks Correct!
Correct!
shortest Correct!
Correct!
6 / 6 pts
Question 21
Use the image below and the 1 half-life decay time for Uranium-235 and
Potassium-40 to answer the following.
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Answer 1:
Answer 2:
Answer 3:
Answer 4:
After two half-lives, the percentage of parent material is 25 and the
percentage of daughter material is 75 .
After four half-lives, the percentage of parent material is 6.25 and the
percentage of daughter material is 93.75 .
If a sample containing Uranium-235 has undergone 4 half-lives, the sample
is 2.84 billion years old.
If a sample containing Potassium-40 has undergone 3 half-lives, the sample
is 3.9 billion years old.
25 Correct!
Correct!
75 Correct!
Correct!
6.25 Correct!
Correct!
Answer 5:
Answer 6:
93.75 Correct!
Correct!
2.84 billion Correct!
Correct!
3.9 billion Correct!
Correct!
Quiz Score: 34
out of 34