In geology, a period or age is a time span of many millions of years that are assumed to have had similar characteristics. In general, the duration of Periods/Ages tend to get longer the further one travels into the past.
All of these terms are usually treated as a subset of the Proterozoic rather than a period between the Paleozoic and the Proterozoic.
This is largely due to uncertainties in radiometric dating and the problem that deposits suitable for radiometric dating seldom occur exactly at the places in the geologic column where we would most like to have them.
5) In common usage the Tertiary-Quaternary and Paleogene-Neogene-Quaternary Periods are treated as equivalents to the Mesozoic and Paleozoic Periods.
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