Daily Warm-Up Exercises

1Daily Warm-Up Exercises

Day 37What are index fossils?

Index fossils are the remains or traces of organisms that lived for only a short time, but in many places around the world.

Why are index fossils useful to geologists?When geologists find an index fossil in a rock layer, they know it is about the same age as all other rock layers that contain the same index fossil.

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Use Index Fossils(Part 1, steps 10-12)

Investigation 7Fossils and Time

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Index Fossil CorrelationsTurn to page 61 and cut out the profiles of

Bryce Canyon and Zion National Park.

Place the two profiles on page 59 and attach them so the index fossils are aligned correctly.

Turn to page 63 and complete the index-fossil correlation questions.

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Kaibab and Z1 have the same index fossils

Same at Grand Canyon & Zion

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Z7 and B5 have the same index fossils

Z2 and B1 also have the same index fossils

Same at Zion & Bryce

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None

Same at Grand Canyon & Bryce

7 B3 is younger than Supai

Supai is from late Pennsylvania

Triassic is more recent than Pennsylvania

B3 is younger than B1

B1 is from early Triassic

Compare Ages -- B3 vs. Supai

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B2 is younger than B1

B1 is from early Triassic

B2 is younger than Z1

Z1 is from Permian

Triassic is more recent than Permian

Compare Ages -- B2 vs. Z1

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Since coal forms from decayed plants, the environment must have had a lot of plants. The sandstone means that sand was present. The area was probably swampy or on a floodplain.

Environment for B9

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Labels

Exercise 7.2

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CaSE Book Student Resource Book, page 50

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Captions

Exercise 7.3

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CaSE Book StudentResource Book, page 50