https://gcmdservices.gsfc.nasa.gov/kms/concept/8d25cd2c-cb4e-4133-af8b-dcde0775c558
broader |
|
||||||
---|---|---|---|---|---|---|---|
change note |
|
||||||
definition | The Aalenian ( /ɑːˈliːniən/) is a subdivision of the Middle Jurassic epoch/series of the geologic timescale that extends from about 174.1 Ma to about 170.3 Ma (million years ago). It was preceded by the Toarcian and succeeded by the Bajocian. | ||||||
type |
|
||||||
in scheme | chronounits original |