Correlating Rock Layers

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Earth's First Forests

Earliest Mammals

Earliest Grasses

Earliest Stramotolites

​Answer Checkpoint 1-5

Multiple Choice

Checkpoint 1: Which of the fossils is a good index fossil?

Multiple Choice

2. According to the diagrams for all three columns which would be the best index fossil?

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Which letter best represents an index fossil? ​

Select answer

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4. Which letter best represents an index fossil? ​

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5. Which letter best represents an index fossil?   ​

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​Answer questions:

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Multiple Choice

Checkpoint: 2. Volcanic ash is a good geologic time marker because the ash

• A. is deposited rapidly over a large area

• B. spreads evenly in all compass directions

• D. is easily weathered and eroded

• E. remains in the atmosphere for millions of years

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3. Which fossil (letters) appears to have the best characteristics of an index fossil? ​

Select answer

Multiple Choice

6. Which statement best explains why the volcanic ash layers are useful for correlating the relative ages of the bedrock in the three outcrops?

• A. The ash was deposited over a large area when a volcano erupted.

• B. There are no fossils found within the volcanic ash.

• C. The volcanic eruptions that produced the ash layer occurred over a long period of geologic time.

• D. The volcanic ash is found between many different layers of bedrock.

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M

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A