Geologic Time Scale

A unit of geologic time that subdivides eras

• period

• time span

Eras are subdivided into units of geologic time called periods.

• True

• False

___________ a record of the geologic events and the evolution of life forms as shown in the fossil record. 

• Eras

• Geologic Time Scale

 The Quaternary period, where humans first appeared, is in the Mesozoic era.

• True

• False

Which period are we currently in?

• Quaternary

• Holocene

• Jurassic

• Tertiary

Paleontologists infer that the earth is approximately how many years old?

• 4.5 million years

• 450 million years

• 450 billion years

• 4.5 billion years

In which time period are we currently living?

• Precambrian Time

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

Dinosaurs, small mammals, and birds are found in this time period.

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

What are fossils that are abundant, easily recognizable, short lived, and widespread called?

• Preserved fossils

• Index fossils

• Imprints

• Radioactive dating

Preserved remains of plants and animals from the remote past are called?

• Sedimentary rocks

• Radioactive dating

• Decayed organisms

• Fossils