Geologic Time

Geologic Time

Paleontologists think Earth is _ years old.

• Read the timeline - what is the oldest number?

• Check your units - billions? millions?

Multiple Choice

What type of animal lived only during the Mesozoic Era?

• Dinosaurs

• Mammals

• Birds & Mammals

• All of them

Multiple Choice

Which division of the geologic time scale is the shortest?

• Period

• Era

• Eon

• Epoch

Multiple Select

The "Age of the Reptiles" was the ________ Era.

• Cenozoic

• Cretaceous

• Paleozoic

• Mesozoic

Multiple Choice

Which is NOT an eon?

• Hadean

• Archean

• Proterozoic

• Paleocene

Multiple Select

Snails appeared during the ________ Era.

• Cenozoic

• Cretaceous

• Mesozoic

• Paleozoic

Multiple Select

Of the following, which is the youngest period of geologic time?

• Pleistocene

• Quaternary

• Archean

• Devonian

• Paleogene

Multiple Choice

The dinosaurs became extinct about ________ years ago.

• 65 million

• 6.5 billion

• 145 million

• 4.3 billion

Multiple Select

Which of the following is a period of the Mesozoic Era?

• Neogene

• Jurassic

• Ordovician

• Precambrian

Multiple Choice

The timespan that lasted the longest was the

• Cenozoic

• Precambrian

• Paleozoic

• Mesozoic