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The geologic time scale or geological time scale describes how geologic time is divided into standardised intervals. It uses the rock record together with the principles of chronostratigraphy to place rock sequences into their relative age positions, and geochronology techniques, such as radiometric dating, to precisely date the boundaries between them. It is used primarily by Earth scientists to describe the timing and relationships of events in geologic history. The time scale has been developed through the study of rock layers and the observation of their relationships and identifying features such as lithologies, paleomagnetic properties, and fossils. The definition of standardised international units of geological time is the responsibility of the International Commission on Stratigraphy (ICS), a constituent body of the International Union of Geological Sciences (IUGS), whose primary objective is to precisely define global chronostratigraphic units of the International Chronostratigraphic Chart (ICC) that are used to define divisions of geological time. The chronostratigraphic divisions are in turn used to define geochronologic units.
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“Time is an illusion, lunchtime doubly so.”
“If we consider eternity, into that time never entered; eternity is not an everlasting flux of time, but time is as a short parenthesis in a long period; and eternity had been the same as it is, though time had never been.”
“Isn't it amazing the way the future succeeds in creating an appropriate past?”
“All investigations of Time, however sophisticated or abstract, have at their true base the human fear of mortality.”
“The idea that time may be an active factor in causation has the mathematical significance that ' t ' (for the system in question) must appear explicitly in the formulation of the law. ...Such law may claim to express the fact of historic, irreversible duration.”
“Delivered from the galling yoke of time.”
Quotes via Wikiquote (CC BY-SA), each with its original source.