9.6 Geologic Time Scale
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What is the geologic time scale?
The division of Earth history into blocks of time- eons, eras, periods, and epochs. The time scale was created using relative dating principles.
What is an eon?
The largest time unit on the geologic time scale, next in order of magnitude above era
What is the Phanerozoic eon?
The part of geologic time that is represented by rocks containing abundant fossil evidence. The eon extending from the end of the Proterozoic eon to the present.
What are eras?
A major division on the geologic time scale; eras are divided into shorter units called periods
What are periods?
A basic unit of the geologic time scale that is a subdivision of an era.
What is an epoch?
A unit of the geologic time scale that is a subdivision of a period
What is Precabrian?
All geologic time prior to the Phanerozoic eon. A term encompassing both the Archean and Proterozoic eons