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I To complete worksheet, see instructions in the textbook (Ch. 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
Table 4. Sequence of Events Using all the information given, number the events in order from oldest to youngest. Event Order (1 for oldest to 12 for youngest) 6 1313 141 1 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 (5) Development of a nonconformity on granite (not assigned a letter) NO
▼ Granite (G) BIU A A - Dike (D) 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. These calculations are meant for practice, and a new question will be given on the quiz to determine your understanding of calculating isotopic ages. The quiz question will use the same concepts/procedure, but contain different numbers. Rock Unit Half-Life of Isotope 0.75 billion years T 50 million years # Parent Atoms 250 125 EE #Daughter # of Half Lives that Atoms Have Passed 1750 3875 Age