Geology. noting or pertaining to a period of the Mesozoic Era, from 140 million to 65 million years ago, characterized by the greatest development and subsequent extinction of dinosaurs and the advent of flowering plants and modern insects.
n. 名词 noun
Geology. the Cretaceous Period or System.
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The black market trade in fossils stolen from the richest Cretaceous fossil locality in the world has prompted a crackdown.
This shallow-water phase existed throughout Jurassic and Lower Cretaceous times.
Marls and limestones with fossils of an Eocene facies overlie the Cretaceous rocks on the Gabun.
Other Ornithosaurs, such as Ornithocheirus from the Cretaceous rocks, have the neck much more massive.
There are two remarkable modifications of the early dorsal vertebræ in some of the Cretaceous Pterodactyles.
Cretaceous Ornithosaurs sometimes differ from birds apparently in admitting the quadrato-jugal bone into the orbit.