Geologic Time Scale

Front

The Geologic Time Scale is a record of what?

Back

the known history of rocks and fossils

Front

How old do Paleontologists believe the Earth is?

Back

4.6 billion years old

Front

Paleozoic, Mesozoic & Cenozoic are all

Back

Eras

Front

Which is the most recent era of time- the one that we are currently in? Options: Mesozoic, Paleozoic, Cenozoic, Precambrian

Back

Cenozoic

Front

True or False: Geologists subdivide periods into eras.

Back

False

Front

Describe how geologists separate time periods.

Back

by special events that have happened in that period.

Front

Name the 4 time frames in order from oldest to youngest: Precambrian Time, Paleozoic Era, Mesozoic Era, Cenozoic Era.

Back

Precambrian Time, Paleozoic Era, Mesozoic Era, Cenozoic Era

Front

Which division on the geologic time scale is the shortest? (Options: epoch, era, eon, period)

Back

epoch

Front

The time span that lasted the longest was the...

Back

Precambrian

Front

The Era with the largest extinction we know of is the...

Back

Paleozoic era