from the GNU version of the Collaborative International Dictionary of English
- adj. the time in the latter part of the Mesozoic age during which the Cretaceous formation was deposited, and at the end of which the dinosaurs died out. See Cretaceous.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. from 135 million to 63 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants
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