Page 248 - Laboratory Manual in Physical Geology

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Geologic Cross Section 3
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Geologic Cross Section 4
B. REFLECT & DISCUSS Return to geologic Cross Section 2, and notice how the Colorado River has cut down through the
rocks to create the Grand Canyon Gorge. Discuss with a partner or small group, what law of relative age dating you would
need to apply in order to draw in the rock layers of Grand Canyon Gorge that are missing from the cross section. As exactly
as you can, apply the law and use dashed lines to draw in the contacts between named rock layers that were eroded away in
Grand Canyon Gorge. Compare your completed drawing with those of other geologists.

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