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


