Aalenian
Geologic period
>
The Aalenian is a subdivision of the Middle Jurassic Epoch/Series of the geologic timescale that extends from about 174.7 ±0.8 Ma to about 170.9 ±0.8 Ma. It was preceded by the Toarcian and succeeded by the Bajocian. Wikipedia
Occurred: 174.1 (+/- 1) million years ago - 170.3 (+/- 1.4) million years ago
Epoch: Middle Jurassic
Lower boundary GSSP: Fuentelsaz, Spain; 41°10′15″N 1°50′00″W / 41.1708°N 1.8333°W
Lower GSSP ratified: 2000
Upper boundary GSSP: Cabo Mondego, Portugal; 40°11′57″N 8°54′15″W / 40.1992°N 8.9042°W
Show more
Show less