to record important events and life forms
The geologic time scale.
Geologic Time. It's called the Geologic Time Scale.
Precambrian is the largest division of the geologic time scale.
Phanerozoic is the eon which geologic time scale means visable life.
they use major fossil records
The Precambrian
in the scope of geologic time, how significant is the presence of humans?
Cenozoic
On a geologic time scale, yes. On any other time scale, no.
The geologic time scale shows the timing and relationship of events that have occurred throughout Earth's history.
Eon The largest expanse of time on the geologic time scale is the eon. An eon would encompass at least two eras.
Eon The largest expanse of time on the geologic time scale is the eon. An eon would encompass at least two eras.