Page 8 & 9 ESRT

a model scientists use to describe the timing of events and the relationships between those events in earth’s history.

• geologic time scale

• era

• period

• epoch

a division of geologic time; a subdivision of a period. Shortest length of time.

• geologic time scale

• era

• period

• epoch

What Era were mammals first seen?

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

How old do Paleontologists believe the Earth is?

• 2015 years old
• 3.6 billion years old
• 4.6 billion years old
• 4.6 million years old

The disappearance of a species.

• Evolution
• Extinction
• Migration
• Mutation

geologic time intervals that eras are divided into.

• geologic time scale

• era

• period

• epoch

Age of fish and amphibians

• extinction

• paleozoic era

• fossil record

• Precambrian era

How many millions of years ago did the dinosaurs become extinct?

• 251 mya

• 65.5 mya

• 542 mya

• 251-200 mya

The Grenville Orogeny occurred during which Eon?

• Phanerozoic

• Precambrian

The Coelophysis dinosaur appeared on Earth during which Period?

• Cretaceous

• Jurassic

• Triassic

• Paleogene