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1. 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 ± 1.0 Ma to ... (Earth) [100%] 2023-04-03 [Aptian] [Early Cretaceous]...
2. Aptian: Aptian, in geology, the term introduced in 1843 by A. d’Orbigny for the upper stage of the Lower Cretaceous rocks. In England it comprises the Lower Greensand and part of the Speeton beds; in France it is divided into ... [100%] 2022-09-02
3. Aptian extinction: The Aptian extinction was an extinction event of the early Cretaceous Period. It is dated to c. (Earth) [70%] 2023-10-31 [Extinction events] [Aptian]...