Ex2_RainbowOfStone

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California State University, Fullerton *

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310T

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Geography

Date

Dec 6, 2023

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pdf

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2

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Exercise 2: Rainbow of Stone Movie Questions 10 pts Name: Marisse Turner Watch the video on Canvas and answer the following questions. 1) When did erosion start to carve the Grand Canyon? Erosion began to form the canyon about six million years ago. 2) What is the age of the rocks in the Inner Gorge? The rocks in the Inner Gorge are at the bottom of the canyon, and also the oldest rocks. They age back nearly two billion years. 3) How fast do the tectonic plates move? Tectonic plates move slowly, comparable to the rate a human fingernail grows. 4) Why do we think the Tapeats Sandstone was deposited in a near-shore marine environment? Trilobite trails and worm burrow fossils suggest that the Tapeats Sandstone was deposited in a near-shore marine environment. During the time it took for the Tapeats Sandstone to form, the Grand Canyon area stayed on the edge of the continent that floated across the Earth eventually becoming marine sedimentary rocks. The sandstone represents a beach environment. 5) How have the Depositional Environments changed during the Paleozoic? List them. 6) What feature or property of the rocks causes rapids to form in the Colorado River? Tributary streams 7) What sort of life existed in the Hermit Shale? The Hermit Shale contains fossil imprints of cone bearing plants, ferns, winged insects and animal tracks. 8) How is the Coconino Sandstone different from most of the other Grand Canyon rocks? The Coconino Sandstone’s origin was a vast desert, whereas most of the canyon’s layers consist of marine settlements from ancient seas. The cross beds in the Coconino Sandstone indicate deposition by wind from sand dunes. Tracks and trails that have been preserved in the stone reveal reptiles, spiders and scorpions.
9) Were there more sedimentary rocks on top of the Kaibab Limestone (which makes up most of the rim of the Grand Canyon)? If so, what happened to them? Yes, there were several thousands of feed of sedimentary rock on top of the Kaibab Limestone. Around 65 million years ago, a long period of regional uplift began and as the Earth’s surface began to dome, sediments eroded away. 10) What has been one effect of volcanoes in the Grand Canyon?
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