Geologic Time

Approximately how old is Earth?

• 4,600 years old

• 4.6 million yrs old

• 4.6 billion yrs old

• 4.6 trillion yrs old

Which of the following is not a unit of time used on the geologic time scale?

• epochs

• years

• eras

• eons

Amphibians first evolved during the ____________ period

• Cambrian

• Triassic

• Jurassic

• Devonian

The first jawed fish appeared in the _________ period.

• Triassic

• Silurian

• Jurassic

• Cambrian

The Devonian period is named after a city in...

• France

• Italy

• Sweden

• England

A rock layer is also called a...

• stratum

• igneous

• sedimentary

• geode

Which epoch are we currently living in?

• Tertiary

• Holocene

• Pliocene

• Quaternary

Which period are we currently living in?

• Tertiary

• Holocene

• Pliocene

• Quaternary

Which era are we currently living in?

• Cenozoic

• Mesozoic

• Pliocene

• Quaternary

Which eon are we currently living in?

• Cenozoic

• Mesozoic

• Phanerozoic

• Quaternary