Why are the time periods of the paleozoic and mesozoic subdivided into early, middle, and late instead of named epochs, as they are in the cenozoic? the rocks of these time periods are too young to provide sufficient data to subdivide the periods based on the ages of rocks. the terms early, middle, and late are easier to remember, which removes some confusion for those studying the geologic time scale. the number of fossils discovered outnumbers the quantity needed to subdivide the periods based on the presence of organisms. the fossil record for the paleozoic and mesozoic eras is not sufficient to subdivide the periods based on the presence of organisms?

The time periods of the Paleozoic and Mesozoic are subdivided into early, middle, and late unlike in the Cenozoic because the number of fossils discovered outnumbers the quantity needed to subdivide the periods based on the presence of organisms. 

Early, middle and late time are geological times. Time periods were subdivided because of the major evolutionary events in the fossil record during the Paleozoic and Mesozoic era. 

Under Mesozoic:

·         Cretaceous

·         Jurassic and

·         Triassic

Uner Paleozoic:

·         Permian

·         Carboniferous

·         Devonian

·         Silurian

·         Ordovician and

·         Cambrian

While in Cenozoic we have the tertiary or mammals diversity only.

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