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Aptian

thumb|right|Palaeogeography of the Earth in Aptian. The Aptian is an age in the geologic timescale or a stage in the stratigraphic column. It is a subdivision of the Early or Lower Cretaceous Epoch or Series and encompasses the time from 121.4 ± 0.6 Ma to 113.2 ± 0.3 Ma (million years ago), approximately. The Aptian succeeds the Barremian and precedes the Albian, all part of the Lower/Early Cretaceous.

Key facts

Geologic timespan.name: Aptian
Geologic timespan.color: Aptian
Geologic timespan.time_start: 121.4
Geologic timespan.time_start_uncertainty: 0.6
Geologic timespan.time_end: 113.2
Geologic timespan.time_end_uncertainty: 0.3
Geologic timespan.timeline: Cretaceous
Geologic timespan.name_formality: Formal
Geologic timespan.celestial_body: earth
Geologic timespan.usage: Global (ICS)
Geologic timespan.timescales_used: ICS Time Scale
Geologic timespan.chrono_unit: Age
Geologic timespan.strat_unit: Stage
Geologic timespan.timespan_formality: Formal
Geologic timespan.lower_boundary_def: Not formally defined
Geologic timespan.lower_def_candidates: Base of magnetic polarity chronozone M0r. Near FAD of the Ammonite Paradeshayesites oglanlensis
Geologic timespan.lower_gssp_candidates: Gorgo a Cerbara, Piobbico, Central Apennines, Italy
Geologic timespan.upper_boundary_def: FAD of the Planktonic Foraminifer Microhedbergella renilaevis