Age (geology)

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e  h
Units in geochronology and stratigraphy[1]
Segments of rock (strata) in chronostratigraphy Time spans in geochronology Notes to
geochronological units
Eonothem
Eon
4 total, half a billion years or more
Erathem
Era
10 defined, several hundred million years
System
Period
22 defined, tens to ~one hundred million years
Series
Epoch
tens of millions of years
Stage
Age
millions of years
Chronozone
Chron
subdivision of an age, not used by the ICS timescale

A geologic age is a subdivision of geologic time that divides an epoch into smaller parts. A succession of rock strata laid down in a single age on the geologic timescale is a stage.

See also[edit]

References[edit]

  1. ^ Cohen, K.M.; Finney, S.; Gibbard, P.L. (2013), International Chronostratigraphic Chart, International Commission on Stratigraphy .