1 Daily Warm-Up Exercises Day 37 What 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.
Use Index Fossils (Part 1, steps 10-12) Investigation 7 Fossils and Time
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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.
2
Use Index Fossils(Part 1, steps 10-12)
Investigation 7Fossils and Time
3
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
8
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
9
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.