GNU Webster's 1913
- adj. (Geol.) 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.
- n. from 135 million to 63 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants
“If we survey the fossils so far known in historical order, the following facts are ascertained: The earliest or primary period of the earth is the era of the Pteridophyta, the ferns, horsetails, and club-mosses; in the Triassic and Jurassic periods the gymnosperms prevail, and beginning with the cretaceous period the angiosperms.”
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