of or relating to or denoting the second period of the Mesozoic era
source: WordNet 3.0
Of the age of the middle Mesozoic, including, as divided in England and Europe, the Lias, Oölite, and Wealden; -- named from certain rocks of the Jura mountains.
source: Webster 1913
noun
from 190 million to 135 million years ago; dinosaurs; conifers
