1. An Early Cretaceous age, preceded by the Barremian, followed by the Albian, and dated at 124.5–112 Ma ( Harland et al., 1989).
2. The name of the corresponding European stage, which is named after Apt in France. See also NEOCOMIAN.
"Aptian." A Dictionary of Earth Sciences. . Encyclopedia.com. (October 20, 2018). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/aptian
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