Question 1

Why is the statement, "The Jurassic system lasted from 200-146 million years ago," incorrect? How would you correct it? In your explanation, be sure to distinguish between time-stratigraphic units and time units.

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Question 2

Why are most fossils found in sedimentary rock, rather than in igneous or metamorphic rocks?

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Question 3

Discuss William Smith's principle of fossil succession. Why is this principle important in relative geologic dating?

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Question 4

Discuss the branch of geology called stratigraphy and how the fundamental geologic principles are used to unravel stratigraphic relationships.

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Question 5

Discuss the application of absolute dates to the relative Geologic Time Scale. What are the limitations of this application?

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Question 6

Discuss Walther's law and its application to determine marine transgressions and regressions.

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Question 7

Disconformities exist between parallel layers of sedimentary rocks, and consequently, are hard to identify. What geologic process must occur for an unconformity to develop? What is one way to identify a disconformity, other than numerical dating?

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Question 8

Compare and contrast the three types of unconformities. What differences in geologic history do these three types imply?

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Question 9

Compare and contrast regression and transgression. What sea level changes do these geologic sequences imply? What could cause these changes? Give specific examples of regressive and transgressive sequences.

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Question 10

Two layers of limestone are found 200 kilometers apart. Give two lines of evidence that could show the layers are correlated.

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Quiz 5: Rocks Fossils and Time Making Sense of the Geologic Record