Lowest stage of the Middle Jurassic period which occurred between 175.6 million and 171.6 million years ago.
AALENIAN: "The Aalenian Stage is divided into the Lower Aalenian and the Upper Aalenian."
Link to This DefinitionDid you find this definition of AALENIAN helpful? You can share it by copying the code below and adding it to your blog or web page.
Edited and fact checked by Pam: Google +