Lab 4 Worksheet strat sp 2021

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Richland Community College *

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1402

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Geology

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Apr 3, 2024

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docx

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4

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Lab 4 Worksheet Stratigraphy, Physical Correlation (50 points) Spring 2018 Name ______ (-2 points if missing) Date _______ Use your lab book, lab and lecture PowerPoints, and internet as needed to answer all questions in each of the 2 parts. Please explain everything in your own words. Part 1 Stratigraphy (47 points) 1. Explain the difference between lithostratigraphic correlation, biostratigraphic correlation, and chronostratigraphic correlation. a. 2. Define a formation. a. 3. Define a contact. a. 4. What is the difference between a ‘group’ and a ‘member’ as they relate to formations? a. 5. What are the criteria to be a good index fossil? a. b. c. d. e. 6. Explain the difference between geochronology and chronostratigraphy. a. 7. Fill in the gaps in the following table: Eon System Epoch Stage 8. Who makes up these rules??? a. 9. PART A: A somewhat generalized stratigraphic section of a rock column expose in central Utah is presented in figure 5.5, utilizing conventional symbols for rocks.
(See lab ppt) Unconformities are shown with a wavy line and a U. The relative resistance to weathering is shown by the right margin of the strat column, Cliff forming units extend to the right, slope forming units are recessed to the left. In Utah, limestone, and some well cemented sandstone and conglomerates form cliffs, while finer grained siltstone and shales for slopes. Complete the following: 10.Based on your analysis of the column, subdivide the rocks in figure 5.5 into formations, using the lithology and erosions characteristics as a guide. Mark your subdivisions or formations with heavy horizontal lines as shown for the lower two formations. 11.Identify the lithology for each of your units. 12.PART B: Formations are mappable units. Lines delineating the boundaries between formations on a geological map are called contacts. On figure 5.6, trace the contacts between the 10 formations by simply following the contour lines. The contact elevations are below the map. As these units are horizontal, the contacts will follow the contour lines. Color each unit with the color of your choice. 13.PART C: The Redwall Limestone has fun fossils! Your mission is to plot the occurrence of the biozones on the chart in Figure 5.8. Please see ppt for detailed instructions/assistance, as only parts of this are to be completed by you. Part 2 Physical Correlation (40 points) 14.PART D: Using the formation contacts and formation names provided, construct lines of lithostratigraphic equivalence between the 4 sections. Please see ppt for detailed instructions/assistance. Use the attachment called Lab 4 correlation to complete this exercise. Print the page for your correlation. It does not matter if it is color or black and white. Take a digital image of your work and paste it into this document.
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