Concepts
Geologic Time Scale
Also Known As Geological Time Scale
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The standardized division of geologic time into eons, eras, periods and epochs, combining chronostratigraphy, the study of rock sequences, with geochronology, the dating techniques that anchor them to real years. It is the chart this atlas's own era entities are drawn from, arranging the planet's 4.54 billion year history into categories a reader can hold in mind.
Facts
Origin YearThe relative scale was assembled across the nineteenth century; 1913 is Arthur Holmes' The Age of the Earth, the first geologic time scale anchored to radiometric dates. Cross-Tradition Connections
Anticipated By
The relative ordering superposition provides is what the geologic time scale grew from.
Associated With
Radiometric ages are what give the geologic time scale its absolute dates.
In Discipline
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