Aalenian 1
noundomain: time
EnWordnet [ver.5.0]
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EnglishDefinition
a subdivision of the Middle Jurassic epoch that extends from about 175.6 to about 171.6 million years ago.
Examples
- 1.The base of the Aalenian is defined as the place in the stratigraphic column where the ammonite genus Leioceras first appears.
