Aa·​le·​ni·​an ä-ˈlē-nē-ən How to pronounce Aalenian (audio)
: of, relating to, or being a period of the Middle Jurassic lasting from approximately 176 million years ago until 172 million years ago
This applies particularly to the thickest of the sandstones, the Bearreraig Sandstone of Aalenian to Bajocian age.J. D. Hudson et al., Journal of the Geological Society, September 2011
see Geologic Time Table
Aalenian noun
Subsequently, during the Aalenian, the motile forms (still present in the water column) had become adapted to life in stressed salinities … Alister James Powell and J. B. Riding, Recent Developments in Applied Biostratigraphy, 2005

Word History


borrowed from French aalénien, from Aalen, town in Württemberg, Germany, the location of strata defining the period + -ien -ian

First Known Use

1882, in the meaning defined above

Time Traveler
The first known use of Aalenian was in 1882

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Cite this Entry

“Aalenian.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Aalenian. Accessed 17 Apr. 2024.

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