Sedimentary+Rock+Identification+Lab
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School
Liberty University Online Academy *
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Course
211
Subject
Geology
Date
May 18, 2024
Type
Pages
4
Uploaded by disneygirl1995
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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4 rock and what does it tell you about the environment in which it formed? State your answer in complete sentences.