Earth System History 4e & Launchpad Solo For Earth System History (six Months Access)
Earth System History 4e & Launchpad Solo For Earth System History (six Months Access)
4th Edition
ISBN: 9781319126087
Author: Steven M. Stanley, John A. Luczaj
Publisher: W. H. Freeman
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Chapter 15, Problem 1RQ
To determine

The reason behind the repeated expansion and contraction of shallow seas over the midcontinent United States during Late Carboniferous time.

Expert Solution & Answer
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Answer to Problem 1RQ

The continual expansion and contraction of glaciers in Gondwanaland caused the expansion and contraction of shallow seas over the midcontinent United States.

Explanation of Solution

The alternative transgression and regression of shallow seas are described as cyclothems. Most cyclothems are of late Carboniferous (Pennsylvanian) age. The cyclothems are the result of repeated expansion and contraction of glaciers in Gondwanaland.

Coal deposits formed within the cyclothems. A transgression produces the lower part of a cyclothem, where marine sediments are superimposed on nonmarine sediments. Nonmarine material is underclay on which coal-swap plants grew and then died to produce the peat that ultimately would become coal.

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Earth System History 4e & Launchpad Solo For Earth System History (six Months Access)

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