Sedimentary+Rock+Identification+Lab
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School
Liberty University *
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Course
9994
Subject
Geology
Date
Jan 9, 2024
Type
Pages
4
Uploaded by ChiefGoldfinch3632
1
SEDIMENTARY ROCK IDENTIFICATION LAB
Name:
Date:
Objective
To identify sedimentary rocks based on grain size, texture, and composition
Materials
•
Clastic/Chemical Sedimentary Rock Charts
•
Mohs Hardness Scale (Optional, used in previous lab)
Purpose
(5 pts)
Write 1–2 sentences stating the purpose of this lab.
What do you expect to learn? What do you want the
outcome to be?
Hypothesis
(5 pts)
Write your hypothesis for this lab.
It should be 1 sentence and be an if/then statement.
(Remember this
is your educated guess as to what will happen in this lab.)
Procedure
1.
Read through all of the steps in the procedure as well as the
Data
section. Then complete the
Purpose
and
Hypothesis
sections.
2.
Using the information provided in the
Data
table and the Clastic and Chemical Sedimentary Rock
Chart complete the
Data
table and name each sedimentary rock.
3.
Complete the
Observations
,
Analysis and Conclusion
, and
Application
sections before submitting
the lab assignment.
2
Data
(60 pts)
You may want to refer to the Mohs Hardness scale chart from the Mineral Identification Lab to help you
decipher the composition based on hardness. You will also want to keep in mind that calcite reacts with
hydrochloric acid.
(2 pts per blank = 60 pts total)
Image
Number
Category
(Clastic, Chemical,
Organic/Biologic)
Texture
Hardness
Composition
or Sediment
Name
Rock
Name
1
Fine to
coarse
Crystalline
3
2
Organic/ Biologic
3
3
Fine to
coarse
Crystalline
2
Calcite and some
shell and skeleton
fragments
4
3
5
Very Fine
(< 1/256
mm)
N/A
Mud
6
N/A
7
> 2 mm
N/A
3
8
7
Silica (Quartz)
9
N/A
10
Biologic
N/A
Altered Plant
Fragments
Data Table 1
Observations
(10 pts)
What do you notice about the differences between clastic, chemical, and organic sedimentary rocks from
the samples you looked at? State your answer in 2-3 sentences.
Analysis & Conclusion
(10 pts)
Which characteristic was most helpful in identifying the rock (texture, grain size, composition)? How
could this lab exercise be improved? Is there any additional information that would have been helpful to
you in identifying the rock samples? Did you struggle to identify any of the samples and if so, why? State
your answer to these questions in complete sentences.
Application
(10 pts)
Imagine you are walking in the woods and you come across a gray rock composed of a number of
different fossilized organisms such as crinoids, trilobites, and brachiopods. You pour some hydrochloric
acid on the rock and notice that it reacts to the acid. Based on this information, what is the name of this
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rock and what does it tell you about the environment in which it formed? State your answer in complete
sentences.