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Question

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https://ksugis.maps.arcgis.com/apps/MapSeries/index.html?appid=ef40bb9e4e904c9f9d8f125b6f589376

Note: I have experienced intermittent problems accessing the website used to answer #3. You may

use the graphic below to answer this question if you encounter this issue.

3. During the Devonian Period, where is North America located relative to the Equator? (Hint: if using

the website to answer this question, g

o to “Close

-up: Phanerozoic Eon,” then click on De

vonian in the

time scale image.)

A. Predominately east of the equator

B. Predominately west of the equator

C. Predominately north of the equator

D. Predominately south of the equator

Rock Types

6. Why are there no rock layers younger than the Kaibab formation

within the stratigraphic section

shown?

A.

All the rock layers are younger than the Kaibab formation

B. The Kaibab formation was the last layer to be deposited

C. The Colorado River eroded younger layers

D. The Great Unconformity is younger

Explanation / Answer

Answer

(3) D. near west of equater

Explanation - During the Devonian, there were three major continental masses: North America and Europe sat together near the equator, with much of their current area covered by shallow seas. To the north lay a portion of modern Siberia. A composite continent of South America, Africa, Antarctica, India, and Australia dominated the southern hemisphere.

(6) B.

The kaibab formation was the last layer to be deposited.

Explanation - Its Age approximately 270 million years ago. One of the top layers of the Grand Canyon.

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