Fossils & Extinction

Front

How do we know when ichthyosaurs became extinct?

Back

After a certain point in the fossil record, no ichthyosaur fossils are found.

Front

During which period did icthyosaurs become extinct?

Back

tertiary

Front

During which period did ichthyosaurs first appear?

Back

triassic

Front

Many parts of the world show a layer of iridium, a common element in asteroids, in rocks dating back 65 million years. What do scientists infer from this?

Back

This iridium layer suggests there was an asteroid impact.

Front

Which statement is true?

• Trilobites are the youngest fossils shown.
• Ferns are older than ammonites.
• Ammonites are older than ferns.

Back

Ammonites are older than ferns.

Front

What is this a picture of? Options: layers of Earth, periods of time, a pretty cool fossil collection, the fossil record

Back

the fossil record

Front

After which layer was there a mass extinction? Options: after the blue layer, after the green layer, after the yellow layer, after the red layer

Back

after the yellow layer

Front

How do we know there was a mass extinction after the red line layer?

Back

There are more fossils under the red line than over, suggesting organisms died off.

Front

Is there more BIODIVERSITY above or below the line?

Back

There is more biodiversity below the line.

Front

Which sentence is true?
Hint: Remember where to start in the fossil story timeline!
Options:
- This fossil record shows evidence of a mass extinction AFTER the line.
- This fossil record shows evidence of a mass extinction BEFORE the line.
- This fossil record doesn't show evidence of mass extinction.

Back

This fossil record shows evidence of a mass extinction BEFORE the line.