GeoTime Worksheet
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School
San Jacinto Community College *
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Course
201710
Subject
Geology
Date
Dec 6, 2023
Type
docx
Pages
3
Uploaded by EarlSeahorseMaster256
Geologic Time Worksheet
Week 11
Online Earth Science
Instructions:
Located within the Geologic Time Lab folder, you’ll find:
1.
YouTube video link to the history of geologic time
2.
A geologic time scale
3.
The Grand Teton Fact Sheet
----------------------------------------------------------------------------------------------------------
Answer the following 10 questions using mainly the Grand Teton Fact Sheet.
You may answer these questions by typing into the lines of this document (after
each question) or you may submit your answers in a separate MS Word
document via email attachment.
Question 1:
The geologic history of the Grand Teton Range began approximately
2.7 billion years ago.
During which geologic eon would this have occurred?
-
It would have occurred during the
Archean Eon
.
Question 2:
Read the paragraph that discusses the black dike on Mount Moran.
It
states that the dike “sticks out” because the rock that it’s made of is harder than
the metamorphic rock in which it formed.
a.
What is the name of this rock?
(Basalt, diabase, granite)
-
The name of this rock is
Diabase
.
b.
If it “sticks out”, is it...
(More resistant to weathering, less resistant)
-
It would be
more resistant
to weathering
Question 3:
Consulting the stratigraphic column diagram, which formation is
older:
Wosley Shale or the Gallatin Limestone?
-
The oldest formation is the
Wosley Shale
Question 4:
Over the Grand Teton region, it states that “inland seas flooded the
region about 510 million years ago”.
During which period of geologic time did this
occur?
-
It would have occurred during the
Cambrian period.
Question 5:
Which region or range, located east of the Grand Teton region, was
formed primarily by eruptions of lava and volcanic debris?
-
The range formed primarily from lava eruptions and volcanic debris is the
Absaroka Range
.
Question 6:
A fault is a break in the Earth’s crust along which there is movement.
When the Grand Tetons were forming, were they... (uplifted or downthrown)?
-
Uplifted
Question 7:
A diagram on the second page of this handout shows “Stretching”
that has occurred over geologic time.
This matches one of the three forms of
geologic stress that can be applied to a region... would this be: (tension,
compression, or shear)?
(Hint: you can “google” tectonic stress types if you need)
-
This “stretching” is known as
Tensional Stress
(Tension)
Question 8:
Only 2 million years ago were the Grand Tetons covered by glaciers.
What was the cause of this glaciation?
In other words, what was happening to
the Earth’s climate then?
-
The climate was
cooling
because of the
Pleistocene Ice Age
.
Question 9:
Over the past 40 years, what percentage have these glaciers
retreated?
-
These glaciers have retreated
20-25%
Question 10:
True or False -- It is perfectly fine to collect rocks in Grand Teton
National Park
-
False
, it is prohibited.
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