Fossils & Extinction

How do we know when ichthyosaurs became extinct?

• Because we don't have ichthyosaurs today

• an asteroid wiped out all the dinosaurs

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

Tags

NGSS.MS-LS4-1

NGSS.MS-ESS1-4

During which period did icthyosaurs become extinct?

• cretacious

• tertiary

• jurassic

Tags

NGSS.MS-LS4-1

During which period did ichthyosaurs first appear?

• cretacious

• triassic

• jurassic

Tags

NGSS.MS-LS4-1

NGSS.MS-ESS1-4

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?

• This iridium proves there was a mass extinction.

• This iridium layer suggests there was an asteroid impact.

• Some say it was an asteroid impact, but it most likely was not.

Tags

NGSS.MS-ESS1-4

Which statement is true?

• Trilobites are the youngest fossils shown.

• Ferns are older than ammonites.

• Ammonites are older than ferns.

Tags

NGSS.MS-LS4-1

NGSS.MS-ESS1-4

What is this a picture of?

• layers of Earth

• periods of time

• a pretty cool fossil collection

• the fossil record

Tags

NGSS.MS-ESS1-4

After which layer was there a mass extinction?

• after the blue layer

• after the green layer

• after the yellow layer

• after the red layer

Tags

NGSS.MS-LS4-1

NGSS.MS-ESS1-4

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

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

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

• The red line shows a layer of rock that is different than the others.

Tags

NGSS.MS-LS4-1

NGSS.MS-ESS1-4

Select all answers that apply.

Choose all the organisms shown in this fossil record picture that went extinct after the cretacious period.

• ammonites

• dyrosaurs

• tarbosaurus

• ichthyosaurs

• pterosaurs

Tags

NGSS.MS-LS4-1

Is there more BIODIVERSITY above or below the line?

• There is more biodiversity above the line.

• There is more biodiversity below the line.

• The biodiversity level is about the same above & below the line.

Tags

NGSS.MS-LS4-1