What Do the Periods on the Geologic Time Scale Represent?

Answer

Periods in geologic time scales represent time between occurrences, where a specific kind of life form was prevailing. They are time frames of rock developments in which slight rock displacements took place.
Q&A Related to "What Do the Periods on the Geologic Time Scale..."
Usually, they represent periods between extinction events, where a particular type of lifeform was dominant.
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From most recent to oldest they are generally considered to be the following (except in Europe where the Mississippian and Pennsylvanian is combined into one period called Carboniferous
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The geologic time scale relates geologic strata (rock layers) to
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The geologic time scale is not an arbitrary listing of the Earth’s natural history—each specific boundary between divisions represents a change or event that delineates
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