EBK EARTH SYSTEM HISTORY
4th Edition
ISBN: 9780100601154
Author: Stanley
Publisher: YUZU
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Question
Chapter 14, Problem 1RQ
To determine
The important ways in which the invertebrate life changed between Ordovician time and Devonian time.
Expert Solution & Answer
Answer to Problem 1RQ
The mass extinction in the ocean during Ordovician Period, lead the development of more advanced reef builders and swimming predators. At the end of Devonian Period, plants spread over the land and vertebrate animals invaded the
Explanation of Solution
The marine taxa during Ordovician Period rediversified and became the members of the Silurian and Devonian biota. This diversification was caused due to the mass extinction in the ocean at the end of Ordovician Period about 400 million years ago.
The bivalve mollusks invaded the nonmarine habitats and were found in the Upper Devonian strata of New York State. Some of the important ways in which the life of invertebrates changed include luxuriant reefs and new swimming invertebrates were found.
The reefs produced by the Corals and stromatoporoids were much larger than any of the Cambrian or Ordovician age. Coral-strome reefs attained enormous proportions during Devonian Period. The fossil preserved in reef rocks shows that many invertebrates in habited coral-strome reefs.
A group of straight-shelled nautiloids evolved into new invertebrate swimmers during Early Devonian time. This new kind of swimming animals was called ammonoids. They were coiled cephalopod mollusks and many of them were predators.
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▲ Figure 9.7 This diagram showing common depositional landforms depicts a hypothetical area affected by ice
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Figure 9.9 is a stereogram showing a portion of the area covered by the Whitewater, Wisconsin, topographic map (Figure 9.10, page 160). Use the stereogram and the map to complete the following.
7. The streamlined, asymmetrical hills composed of till, labeled B, are what type of feature?
8. Examine the shape of the features labeled B on the map in Figure 9.10. How can these features be used to determine the direction of ice flow in a glaciated area?
9. Using the features labeled B in Figure 9.10 as a guide, draw an arrow on the map to indicate the direction of ice movement that occurred in this region.
10. What is the likely location of the outwash plain on the map? Identify and label the area "outwash plain." (Hint: Refer to Figure 9.7.)
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