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BIU A A- 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 ▼ Granite (G) Dike (D) Half-Life of Isotope 0.75 billion years 50 million years # Parent Atoms Order (1 for oldest to 12 for youngest) 250 125 # Daughter # of Half Lives that Atoms Have Passed 1750 EE 3875 Table 4. Sequence of Events Using all the information given, number the events in order from oldest to 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) Age
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
New I 12 - BIU A-A- O = EE 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. 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.