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University of Colorado, Boulder *
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Course
1030
Subject
Geology
Date
Apr 3, 2024
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jpg
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1
Uploaded by DrSnow6392
Name @mc\//k\ Cja((an 4‘/ Lab C — Geologic Time understanding of how rocks are numerically dated and what event in the history of a rock is being dated. In the pre-lab we also explored the methods by which geologists were able to construct the geologic time scale. Today, we will contemplate how to assign numerical ages to the scale’s time boundaries. Practice using relative dating techniques Through the application of the principles you practiced in the pre-lab, you can determine the relative ages for even a large and complex stack of rocks. Question L1: Fig. C-1 is a diagram of the rocks exposed on the walls of the Grand Canyon. In questions 1-6 of the pre-lab, you applied the five principles of relative dating to determine the relative ages of a handful of Grand Canyon rocks. Here, harness those techniques to determine the relative ages for ALL the Grand Canyon rocks plus the cutting of the Canyon itself. On the line next to each formation or event name, number that formation’s or event’s place in the relative list of ages, using #1 for the oldest rock or event, #2 for the next oldest, etc up to #21. To the right of the diagram is a list of the relative age sequence with the oldest (#1) at the bottom. On the line next to each event number list and briefly describe the principle(s) you employed to determine the proper place of that rock or event in the relative age sequence. 3 is a diagram showing the relationships of all rocks exposed in the Boulder area relative to one other and the iy ogic time scale (Fig. C-4) in which they were formed. All of these rocks are sedimentar ept.fortheIdaho Pateogene dik d-sitfs—H: seful relative dating techniques to determine the proper Springs, Bouler Creek, and AleogeD age sequence for Boulder’s rocks- Werite-the propet ace-in-the relative age sequence, #14 for the youngest. Next to the number, briefly describe using #1 for the-oldest rock, #2 for the next oldest, etc up to rock principle(s) you employed to determine the proper place of that rock or event in the relative age sequence. Practice calculating a numerical rock date using a radiometric dating method me of Boulder’s rock units. In the pre- Let’s now try our hand at using radiometric dating techniques to calculate numerical ages for so . lab we covered the necessary theoretical background behind how radiometric dating works. But because the number of parent atoms in estion L2: Fig. C-
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