Geologic Time Scale

_______________ is the long span of time that begins geologic time.

• Precambrian Time
• Cenozoic Time

A unit of geologic time that subdivides eras

• period
• time span

The Triassic Period, the Jurassic Period, and the Cretaceous Period occurred in what era?

• Cenozoic
• Mesozoic

Scientists divided the time between Precambrian Time and the present into three units of time, or eras.

• 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

Eras are subdivided into units of geologic time called periods.

• True
• False

Which period are we currently in?

• Quaternary
• Holocene
• Jurassic
• Tertiary

Which era is the longest?

• Cenozoic
• Cambrian
• Precambrian
• Phanerozoic

The geologic time scale is a record of....

• the history of fossils only
• the history of rocks
• the history of rock layers and fossils
• geologist notes