Definition of Aalenian
: 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
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