5 GEOLOGIC TIME HOMEWORK 3 26 21-1
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GEOLOGIC TIME HOMEWORK
Using the figure below answer the following questions:
Image 1: CC BY-SA 1.0
Woudloper
opengeology.org/textbook, https://commons.wikimedia.org/w/index.php?curid=6526213
Units B and D are Igneous. The large swirly unit on the bottom is Metamorphic. A and F
are faults. C and E are Sedimentary layers.
The wavy horizontal line is an unconformity.
1)
What type of unconformity is present in this sequence? Draw an arrow to it.
2)
Explain the formation of this unconformity.
3)
Is igneous dike D older or younger than the fault A.
Give your geologic principle
for proof.
4)
Is the Igneous batholith B older or younger than Fault A?
Give your geologic
principle to support your answer.
1
5)
Is Fault A older or younger than fault F? Explain.
6)
If Igneous dike D is determined by radioactive decay method to be 1.2 million
years old, what age information can you say about layer C. Explain.
7)
What age information can you attribute to layer E, knowing the age of Dike D.
8)
If Igneous batholith B has 25% radioactive parent material left and 75% stable
daughter material, how many half-lives have passed?
9)
If the half-life duration of the radioactive material in batholith B is 1.5 million
years, how old is batholith B.
10)
Now that you know the age of batholith B and Igneous Dike D, Give a
possible age range for the unconformity.
2
Using the radioactive decay curve below answer the following questions:
Image 2: courtesy of SERC Carleton.edu NAGT teaching workshop.
https://serc.carleton.edu/NAGTWorkshops/time/geochronology.html
If sample A has 75% Radioactive Parent isotopes and 25% Stable daughter product, how
many half-lives have passed?
If the half-life for Sample A is 200 million years how old is Sample A.
Explain why half-life decay cannot be used accurately after 6 half-lives.
3
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On the geologic time scale what percentage of the Earth’s time is represented by the
Precambrian.
How many Mass extinctions are recorded in this time scale?
Image 3: Public domain National Parks Service.gov.
https://www.nps.gov/subjects/geology/time-scale.htm
4
AGE SEQUENCE THE FOLLOWING TWO DIAGRAMS FROM OLDEST TO
YOUNGEST. Include any unconformities – name the type.
A is an unconformity. Unit L is an Igneous intrusion. F is a fault. There are 10.
Image 4: Siobhan McGoldrick CC BY 4.0 International
https://openeducationalberta.ca/practicalgeology/chapter/lab-7-
exercises/
YOUNGEST
_____
_____
_____
_____
_____
_____
_____
_____
_____
OLDEST
_____
5
All units are sedimentary except, for the dark brown which is an igneous intrusion.
The dark blue line is a fault that cuts across all units. List the layers by color.
There are 7
components/colors
.
Image: contributing authors
Daniel Hauptvogel, Virginia Sisson, Carlos Andrade
https://uhlibraries.pressbooks.pub/historicalgeologylab/chapter/chapter3-geologic-time/
YOUNGEST
_____
_____
_____
_____
_____
_____
OLDEST
_____
6
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