Periods are subdivisions of geological eras.
groups ()
periods
To see the difference between eras over time is the purpose of a geological timeline.
a geologic time scale has eras, made up of periods, epochs, etc. hope this helps! :D
The Geologic Time Scale is divided up by four major intervals. In order from Largest to smallest: Eons are the largest time frame covering hundreds of millions of years. Eons are divided into smaller time intervals known as Eras. Eras are subdivided into Periods. Periods are broken into finer subdivisions known as Epochs.
Geological eras can be divided into periods, epochs and ages.
epochs or eras
what is the basis on which subdivisions are made
Eras are subdivisions of larger units of geologic time called eons.
groups ()
Geological eras can be divided into periods, epochs and ages.
periods
The Precambrian Era can be divided into three major eras. These eras include the Hadean, the Archean, and the Proterozoic.
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Eons, Eras,Epochs, and period
eras
To see the difference between eras over time is the purpose of a geological timeline.