Lab 1 Worksheet spring 2024
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Lamar University *
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Feb 20, 2024
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Lab 1 Worksheet Sedimentary Rocks and Depositional Environments (50 points; 50 possible answers)
Name ______ (-2 points if missing)
Date _______
PDFs AND HANDWRITTEN SCANS WILL NOT
BE GRADED. ANSWERS MUST BE TYPED IN. ONLY THINGS YOU NEED TO TAKE AN IMAGE OF MUST BE HANDWRITTEN
Use your lab book, lab PowerPoints, and your brain as needed to answer all questions in each of the 2 parts. Please explain everything in your own words.
Part 1 Sedimentary Rocks Chapter 3
1.
Explain the difference between a quartz arenite and a feldspathic arenite.
a.
2.
What is meant by sorting of clastic sediments?
a.
3.
Identify one well sorted clastic rock and one poorly sorted clastic rock.
a.
b.
4.
Explain what is meant by provenance? a.
5.
How do the grains, sorting, and texture of a clastic rock tell us about provenance?
a.
6.
Describe the difference between an arenite and a wacke.
a.
7.
What information do we get from the colors of some clastic rocks?
a.
Red: b.
Black: c.
Red, pink, tan, yellow: d.
Green, gray: 8.
From the lab book define each of the following:
a.
Skeletal remains: b.
Intraclasts: c.
Ooids: d.
Peloids: 9.
Explain how ooids form?
a.
10.Explain the difference between a packstone and a grainstone.
a.
11.What is micrite?
a.
12.In what order do the evaporites develop?
a.
13.Extensive evaporite deposits of rock gypsum and rock salt are found in which ‘system’ in the United States?
a.
14.Which two fossil types can form boundstone?
a.
15.Which of the following best describes the rock seen in this image? Boundstone, Rudstone, Grainstone, or Packstone. a.
b.
Part 2 Depositional Environments Chapter 4
General questions
1.
What sedimentary rocks do we find forming in a delta and barrier islands environment?
a.
2.
What color of rocks would be common to alluvial fans?
a.
3.
What organisms are common to tidal flats?
a.
4.
What organisms are common to meandering stream environments?
a.
5.
If you lived in the pelagic zone, where do you live?
a.
6.
In which environment would symmetrical ripples develop?
a.
Use the diagrams in chapter 4, Table 4.1 on page 43, pages 48-58, and the information box at the bottom of each picture set, to answer the following questions. (
Caution
: images on backside of page from questions
) Refer back to chapter 3 as needed
.
Part A Figure 4.7 (page 48)
1.
What is the dominant sedimentary rock type shown in figure 4.7?
a.
2.
What does the red color suggest about the environment of deposition?
a.
3.
Rocks of the North Horn Formation were most likely deposited in which of the sedimentary environments listed in table 4.1. Explain your answer.
a.
b.
Explain: Part B Figure 4.8 (page 50)
1.
What is the dominant sedimentary rock type shown in figure 4.8?
a.
2.
What economically important sedimentary rock occurs in this outrcrop?
a.
3.
Rocks of the Blackhawk were most likely deposited in which of the sedimentary environments listed in table 4.1? Explain your answer.
a.
b.
Explain: Part C Figure 4.9 (page 52)
1.
What two sedimentary rocks types predominate in this formation?
a.
2.
Rocks of the Cedar Mountain formation were most likely deposited in which of the sedimentary environments listed in table 4.1? Explain.
a.
b.
Explain: 3.
Thinking question: Why would dinosaur skeletons be found more complete in shale than in sandstone.
a.
Part D Figure 4.10 (page 54)
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1.
What is the dominant sedimentary rock type shown in figure 4.10?
a.
2.
What does the black color suggest about the environment of deposition?
a.
3.
What additional information is provided by the types of fossils found in the Mancos Shale?
a.
4.
Rocks of the Mancos Shale were most likely deposited in which of the sedimentary environments listed in table 4.1? Explain your answer.
a.
b.
Explain: Part E Figure 4.11 (page 56)
1.
How would you describe bedding within the Moenkopi Formation?
a.
2.
What do the mudcracks (Fig. 4.11E) suggest about the depositional setting?
a.
3.
Rocks of the Moenkopi Formation were most likely deposited in which of the sedimentary environments listed in table 4.1? Explain your answer.
a.
b.
Explain: Part F Figure 4.12 (page 58)
1.
What do the cross-bedding, presence of crinoids, and oolitic nature of the limestone indicate about the environment of deposition?
a.