Exploring Geologic Time and Index Fossils

What is the primary purpose of an index fossil in geology?

• To determine the age of rock layers

• To identify the type of rock

• To locate water sources

• To find mineral deposits

Which of the following is NOT a criterion for a fossil to be considered an index fossil?

• Short-lived existence

• Long-lived existence

• Abundance

• Widespread distribution

Why must an index fossil be found in many places around the world?

• To prove it was a dominant species

• To make it useful for global correlation

• To confirm it lived during a specific time period

• To ensure it is easy to find

What does it mean for an index fossil to be abundant?

• It must be found in large quantities

• It must be found in deep rock layers

• It must be rare and unique

• It must be found in a specific region

Why is it important for an index fossil to have a short-lived existence?

• To ensure it is easy to find

• To prove it lived in multiple geologic periods

• To confirm it was a dominant species

• To make it useful for identifying specific time periods

What can be inferred if a rock layer contains an index fossil?

• The rock layer is older than the fossil

• The rock layer is younger than the fossil

• The rock layer is from the same time period as the fossil

• The rock layer contains mineral deposits

Tags

NGSS.MS-ESS1-4

If an index fossil is found in a rock layer, what does it indicate about the layers above and below?

• All layers are from the same time period

• Layers above are younger, and layers below are older

• The fossil is not useful for dating the layers

• Layers above are older, and layers below are younger

Tags

NGSS.MS-ESS1-4

Which of the following is an example of a practical application of an index fossil?

• Identifying the type of rock

• Finding mineral deposits

• Locating water sources

• Determining the age of a rock layer

Tags

NGSS.MS-ESS1-4

What does the presence of fossil D in a rock layer indicate?

• The rock layer is from the Jurassic period

• The rock layer is from the Cretaceous period

• The rock layer is from the Triassic period

• The rock layer is from the Devonian period

Tags

NGSS.MS-ESS1-4

NGSS.MS-LS4-1