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The term ‘deep time’ denotes vast, extremely remote periods of (natural or other) history – distant and extensive spans of time that are almost beyond the grasp of the human mind. In western science, deep time is used to refer to eras dating back to the formation of the Earth (about 4.5 billion years ago) as indicated by empirical evidence, for example, the geological record. The geologist Stephen J Gould provides the following portrayal of deep time in his book Time’s Arrow, Time’s Cycle:

Contemporary Concepts of Time in Western Science and Philosophy