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To complete this worksheet, see the instructions in the textbook...

To complete this worksheet, see the instructions in the textbook (Chapter 9 Investigation).

Table 1. Descriptions of Features

Read the descriptions in the textbook for the features labeled on the figure below (Chapter 9 Investigation), and determine the order in which the features formed. At the end of the exercise, enter the letters of each feature in Table 4.  From observations in nearby areas, the fault (F) occurred after units A, S, and K.





Table 2. Relative Ages of Rock Units and Sediment

Examine the six fossils in the table in the textbook, and the geologic period to which each is assigned; list the letters of all the rock units in order, from oldest to youngest. The rock units and sediments include: A, B, C, D, G, K, L, R, S, and V. If two units are the same age, draw a horizontal line joining them together in the list below. List only the rock units, not other geologic features, such as the fault. Draw a vertical line where a nonconformity, or disconformity, separates two adjacent units (except if it involves units D, L, R, and V).

Oldest _____   _____   _____   _____   _____   _____   _____   ______   _____   ____ Youngest




Table 3. Calculations of Isotopic Ages

Use these data to calculate the isotopic ages of the granite (G) and dike (D). Calculate the number of half lives that have passed and multiply this by the half life of the measured isotope.

Rock Unit

Half-Life of Isotope

# Parent Atoms

# Daughter Atoms

# of Half Lives that Have Passed

Age

Granite (G)

500 million years

125

875

Dike (D)

40 million years

500

500




Table 4. Sequence of Events

Using all the information, number the events in order from oldest to youngest.

Order (1 for oldest to 12 for youngest)

Event

____

____

____

____

____

____

____

____

____

____

____

_____

Deposition of tan sandstone (A)

Deposition of greenish shale (B)

Deposition of coarse sandstone (C)

Formation of dike (D)

Movement along fault (F)

Formation of granite (G)

Deposition of gray limestone (K)

Eruption of lava flow (L) and formation of volcano (V)

Erosion to form narrow canyon (N)

Deposition of older river gravels (R)

Deposition of reddish sandstone (S)

Development of a nonconformity on granite (not assigned a letter)

AFTER COMPLETING THE INVESTIGATION, CLICK ON THE MOODLE LINK “ASSIGNMENT #5: GEOLOGIC HISTORY MULTIPLE CHOICE QUIZ” TO ANSWER 11 MULTIPLE-CHOICE QUESTIONS IN MOODLE BASED ON THE WORKSHEET. YOU DO NOT NEED TO TURN IN WORKSHEET, JUST ANSWER MULTIPLE CHOICE QUESTIONS WHICH ARE WORTH A TOTAL OF 50 POINTS.

1 Attachment
Name _______________________________ Chapter 9 Investigation Worksheet To complete this worksheet, see the instructions in the textbook (Chapter 9 Investigation). Table 1. Descriptions of Features Read the descriptions in the textbook for the features labeled on the figure below (Chapter 9 Investigation), and determine the order in which the features formed. At the end of the exercise, enter the letters of each feature in Table 4. From observations in nearby areas, the fault (F) occurred after units A, S, and K. Table 2. Relative Ages of Rock Units and Sediment Examine the six fossils in the table in the textbook, and the geologic period to which each is assigned; list the letters of all the rock units in order, from oldest to youngest. The rock units and sediments include: A, B, C, D, G, K, L, R, S, and V. If two units are the same age, draw a horizontal line joining them together in the list below. List only the rock units, not other geologic features, such as the fault. Draw a vertical line where a nonconformity, or disconformity, separates two adjacent units (except if it involves units D, L, R, and V). Oldest _____ _____ _____ _____ _____ _____ _____ ______ _____ ____ Youngest
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