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3.3 Index Fossils

Last updated over 5 years ago

12 questions

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Question 1

1.

You find a different rock with some kind of trilobite and an ammonoid. During which period could this rock have formed? Explain.

Question 2

2.

Identify the coral index fossil that would most likely be found in the same layer as the index fossil Ctenocrinus.

Question 3

3.

Each index fossil existed for a relatively short geologic time interval. State one other characteristic that each fossil must have to be considered an index fossil.

Question 4

4.

Look at the image above. Both organisms that formed the fossils found in rock layers 3 and 4

lived during the same period of geologic time

lived in polar regions

are members of the same group of organisms

are still alive today

Question 5

5.

Look at the image above. Evidence best indicates that rock layers 4 and 8 were deposited during the same geologic period because both layers

contain the same index fossil

are composed of glacial sediments

contain index fossils of the same age

are found in the same area

Question 6

6.

Look at the image above. Three rock layers formed during the Silurian Period. Which fossil might be found in these rock layers?

1

2

3

4

Question 7

7.

Fossils of trilobites, graptolites, and eurypterids are found in the same bedrock layer in New York State. During which geologic time interval could this bedrock layer have formed?

Late Ordovician to Early Devonian

Late Silurian to Early Cretaceous

Early Permian to Late Jurassic

Early Cambrian to Middle Ordovician

Question 8

8.

Which statement can best be supported by the fossil record?

Humans have lived on Earth throughout geologic history.

The organisms on Earth have not changed

Most life-forms that existed on Earth have become extinct

Dinosaurs existed on Earth for more than 544 million years

Question 9

9.

According to the fossil evidence which sequence shows the order in which these four life-forms first appeared on Earth? (Use “Life on Earth” column)

reptiles → amphibians → insects → fish

insects → fish → reptiles → amphibians

amphibians → reptiles → fish → insects

fish → insects → amphibians → reptiles

Question 10

10.

Fossils of Brachiopods, Trilobites, and Placoderm fish are found in the same bedrock layer in New York State. Name one period in which this bedrock layer could have formed.

Question 11

11.

You find the fossil (right) in the bedrock of New York State. In what type of rock was it likely found?

Igneous

Metamorphic

Sedimentary

Question 12

12.

How did this rock form? (Use The Rock Cycle if you can’t remember!)