Sed Rocks WAHLK Lab Report
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Porterville College *
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Course
110
Subject
Geology
Date
Dec 6, 2023
Type
docx
Pages
6
Uploaded by ChiefFishMaster618
Geology
Name: ______________________
Soil, Sedimentary Rocks, Structures, and Environments with at home lab kits Lab
Report
Complete your responses in a
color other than black or red.
Part 1: Textural Maturity (Weathering)
1.
Observe samples A and B. What type of weathering has occurred to change from sample A to B?
What evidence do you see for your conclusions?
2.
Observe samples B and C. What type of weathering has occurred to change B into C? What
evidence do you see for your conclusions?
Part 2: Textural Maturity (Transportation and Deposition)
1.
Is sample D mature or immature? Discuss grain size, shape and sorting.
2.
Is sample E mature or immature? Discuss grain size, shape and sorting.
3.
Which sample was deposited closer to its source, D or E? Explain your answer.
4.
Insert a photo
of the sedimentary rocks you chose, with labels next to each one.
Part 3: Compositional Maturity
1.
Consider the shale sample in
figure 6
. What environment(s) would you expect this sample to have
originated from? Why?
2.
Consider the breccia sample in
figure 6
. What environment(s) would you expect this sample to have
originated from? Why?
1
Soil, Sedimentary Rocks, Structures, and Environments with at home lab kits Lab
Report
3.
Consider the coal sample in
figure 6
. What environment(s) would you expect this sample to have
originated from? Why?
4.
Consider the limestone sample in
figure 6
. What environment(s) would you expect this sample to
have originated from? Why?
Part 4: Identifying Sedimentary Rocks
Sample
Sediment/
particle Size
Rounding
(if clastic)
Sorting
Textural
Maturity
(if clastic)
Reacts
to
Acid?
Rock Name
F
G
H
I
J
K
L
M
N
O
2
Soil, Sedimentary Rocks, Structures, and Environments with at home lab kits Lab
Report
Part 5: Forming Sedimentary Structures
1.
Sketch a picture of the arrangement of the dirt, sand, and soil in a dry environment
in the circle
below
.
2.
Sketch what you observed in the tube at the paused 56 second mark of the YouTube video
in the
rectangle below.
3.
What are the differences between the mixture in water and the mixture in air?
3
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Soil, Sedimentary Rocks, Structures, and Environments with at home lab kits Lab
Report
4.
What accounts for the difference in the style of deposition between the two mixtures?
5.
If the following sample exhibits graded beds (as opposed to inverse graded beds) which side of it
was the top (i.e. youngest) at the time of deposition, A or B?
Part 6: Interpreting Sedimentary Structures
1.
Sample Q:
What features in this sample allow you to recognize its bedding?
2.
Why do you think some beds are thicker than others?
3.
Sample R:
Look at the cross-bed angles, grain size, and sorting. Was this sand deposited by wind
or by water? Explain.
4.
How can you explain the fact that the cross-beds in
Sample R
slope in opposite directions? What
can you say about the direction the current flowed or wind blew?
5.
In what type of depositional environment could this rock (Sample R) have been deposited?
(Interesting note: this rock is from the southern Mojave Desert, and is nearly 500 million years old!)
6.
Sample S:
Are the ripples in this sample asymmetrical or symmetrical?
7.
Which way was the current moving? From (A to B), (B to A), or (Back and Forth)?
8.
Suggest a depositional environment in which this rock could have been formed.
4
Soil, Sedimentary Rocks, Structures, and Environments with at home lab kits Lab
Report
9.
Sample T:
Which side of
Sample T
was "up" during its formation, A or B? (Assume side "A" is the
back side of this rock image.)
10.
Name two environments in which mud cracks could form.
Part 7: Soil Classifications by Grain Size Distribution (US Dept. of Agriculture
System)
1.
Observe the test tubes on Canvas in
Figure 10
. Estimate the percentage of each layer. Record the data
from your samples
below
.
Sample #
Sand (ml, %)
% Silt (ml, %)
% Clay (ml, %)
Total (ml, %)
1
2
3
4
2.
Use the USDA soil classification triangle on Canvas to assign a classification name to each sample:
Sample 1:
Sample 2:
Sample 3:
Sample 4:
3.
Perform a quick internet search on "what type of soil is best for plants". Are any of the soils you
classified good for growing a garden or starting a farm?
4.
Of the four locations you classified in
Part 7 question 2
, which would be the best location to start a
farm?
5
Soil, Sedimentary Rocks, Structures, and Environments with at home lab kits Lab
Report
5.
From where is most of the soil on the east side of the San Joaquin Valley derived?
How does it get to
the valley?
6.
What can you say about the relationship between the grain size distribution (
sorting
) of these soils and
their location?
Sample 1:
Sample 2:
Sample 3:
Sample 4:
7.
What
texture
would you expect each of these samples to display based on the distance they traveled
from their source?
Sample 1:
Sample 2:
Sample 3:
Sample 4:
Part 8: Wrap Up
1.
What did you find most interesting about this lab?
2.
If you were to teach this topic, how would you improve this lab?
6
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