Definition of deep time in English:

deep time

Syllabification: deep time

noun

Geology
The multimillion year time frame within which scientists believe the earth has existed, and which is supported by the observation of natural, mostly geological, phenomena.
More example sentences
  • The question of how the Sun shines - that is, the source of its energy - did not become a matter of concern among scientists until the concept of geological deep time was established.
  • The most unsettling aspect of geological deep time was the loneliness of pre-Adamic history, a time span of many millions of years that had gone unwitnessed by human eyes.
  • On the scale of deep time, or within the scope of a system as complex as a planetary ecosystem, it is not even theoretically possible to determine cause and effect.

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