Stratigraphic Units

noun Aalenian

• The Aalenian stage is a subdivision of the Middle Jurassic period.
• I read that the Aalenian stage is from the Middle Jurassic period.
• Yo, did you know about the Aalenian stage in the Middle Jurassic period?
• Just like how the Aalenian stage marks a specific time period, we all have our own defining moments in life.