period is the unit of geologic time that is the greatest span of time.
what unit of geologic time is the greatest span of time?
period
geologic time scale









































the geologic time scale (gts) is a system of chronological dating that relates geological strata (stratigraphy) to time. it is used by geologists, paleontologists, and other earth scientists to describe the timing and relationships of events that have occurred during earth's history. the table of geologic time spans, presented here, agree with the nomenclature, dates and standard color codes set forth by the international commission on stratigraphy (ics).









































section::::terminology.









































the primary defined divisions of time are eons, in sequence the hadean, the archean, the proterozoic and the phanerozoic.
geologic time scale
a major achievement of geochronometry is the documentation of geologic time, as represented in geologic time scales. a geologic time scale is a scheme that integrates the geochronologic subdivisions of geologic time and their absolute ages and durations. the latest version of the geologic time scale was published in 2004, and includes a comparison of present and past time scales. the greater efforts of geochronometry today are aimed at retrieving accurate ages of major events in the earth's history and of stage/age boundaries.









































section::::see also.









































bullet::::- earth science









































bullet::::- stage (geology)









































bullet::::- age (geology)









































bullet::::- geologic time scale
geochronometry