Tầng Aalen

Also known as Aalenian Age, Aalenian Stage

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 (million years ago). It was preceded by the Toarcian and succeeded by the Bajocian.

Key facts

Geologic timespan.name: Aalenian
Geologic timespan.color: Aalenian
Geologic timespan.time_start: 174.7
Geologic timespan.time_start_uncertainty: 0.8
Geologic timespan.time_end: 170.9
Geologic timespan.time_end_uncertainty: 0.8
Geologic timespan.image_outcrop: Aalenian GSSP - Golden spike ceremony - Fuentelsaz, Guadalajara, Spain 08.jpg
Geologic timespan.caption_outcrop: The Aalenian GSSP in Spain
Geologic timespan.timeline: Jurassic
Geologic timespan.name_formality: Formal
Geologic timespan.celestial_body: earth
Geologic timespan.usage