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The 89 pages that link to Geologic time scale, each with the reason it gives.

• FossilRelated: Fossils help define and correlate many divisions of geological time.

• PaleontologyRelated: Provides the chronological framework for locating ancient organisms in Earth's history.

• Radiometric datingRelated: Radiometric measurements calibrate many boundaries and durations in the scale.

• Half-lifeRelated: Long-lived radionuclides provide clocks for dating ancient rocks and calibrating geological history.

• Fossil recordRelated: It organizes fossil succession into named intervals of Earth history.

• Molecular clockRelated: Geological events can independently constrain the dates used to calibrate divergences.

• BiostratigraphyRelated: Fossil succession helps define and correlate many units on this scale.

• PaleobiologyRelated: It places fossil organisms and evolutionary events in time.

• Uranium–lead datingRelated: Uranium–lead dates help anchor boundaries and events deep in Earth's history.

• Late CretaceousRelated: Its hierarchy places the Late Cretaceous within the Cretaceous Period.

• PaleobiogeographyRelated: Its intervals organize distribution changes into comparable stretches of deep time.

• ChronologyRelated: It organizes geological events across billions of years.

• GradualismRelated: It gives gradual geological change the vast timescale needed to accumulate.

• GeologyRelated: It organizes geological events across billions of years.

• Deep timeRelated: Its hierarchy makes immense durations and major transitions easier to organize.

• Structural geologyRelated: Timing structures against rock ages helps reconstruct the sequence of deformation.

• Vertebrate paleontologyRelated: It supplies the time framework for describing when vertebrate groups appeared and disappeared.

• Age of EarthRelated: It divides Earth’s 4.54-billion-year history into named intervals rather than measuring its total age.

• Great Rift ValleyRelated: It places the rift’s development within the long history of African tectonics.

• U–Pb datingRelated: U–Pb ages help calibrate boundaries and events in the time scale.

• Himalayan orogenyRelated: It places the long-running collision within Cenozoic Earth history.

• ChronostratigraphyRelated: Its time intervals provide the framework that chronostratigraphic units represent.

• History of geologyRelated: Its construction converted scattered rock sequences into an increasingly global chronology.

• Jurassic CoastRelated: The coast’s rocks span several time divisions that the geological time scale distinguishes.

• Geologic mapRelated: Map colors and labels often encode the ages of mapped units.

• Late DevonianRelated: It defines the Late Devonian's rank and chronological boundaries.

• Geologic timeRelated: Its hierarchy turns geologic time into a standardized sequence of intervals.

• History of lifeRelated: Its divisions provide the common timeline for major biological events.

• History of paleontologyRelated: Fossils helped define and correlate the intervals used to organize deep time.

• Devils TowerRelated: Dating the Tower’s formation requires placing it within Earth’s long chronology.

• Historical geologyRelated: It organizes reconstructed events into a shared timeline.

• Extinction eventRelated: It provides the framework for locating extinction pulses in deep time.

• Geological history of EarthRelated: Its divisions organize the events and evidence in Earth’s history.

• GeologistRelated: Its divisions give geologists a shared framework for dating Earth history.

• BenbulbinRelated: It places Benbulbin’s rock layers in deep time.

• Earliest known life formsRelated: It places proposed ancient fossils within the long interval before abundant, diverse life appears.

• Geologic recordRelated: Its divisions organize the succession documented in rocks and fossils.