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nounfrom 135 million to 63 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants
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abounding in chalk
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of or relating to or denoting the third period of the Mesozoic era
Definition that contains cretaceous
- tyrannosaurus large carnivorous bipedal dinosaur having enormous teeth with knifelike serrations; may have been a scavenger rather than an active predator; later Cretaceous period in North America
- iguanodon massive herbivorous bipedal dinosaur with a long heavy tail; common in Europe and northern Africa; early Cretaceous period
- plesiosaur extinct marine reptile with a small head on a long neck a short tail and four paddle-shaped limbs; of the Jurassic and Cretaceous
- tyrannosaur large carnivorous bipedal dinosaur having enormous teeth with knifelike serrations; may have been a scavenger rather than an active predator; later Cretaceous period in North America
- coelacanth fish thought to have been extinct since the Cretaceous period but found in 1938 off the coast of Africa
- theropod any of numerous carnivorous dinosaurs of the Triassic to Cretaceous with short forelimbs that walked or ran on strong hind legs
- megalosaur gigantic carnivorous bipedal dinosaur of the Jurassic or early Cretaceous in Europe
- plesiosaurus extinct marine reptile with a small head on a long neck a short tail and four paddle-shaped limbs; of the Jurassic and Cretaceous
- ichthyosauridae later ichthyosaurs of the Jurassic and Cretaceous; widely distributed in both hemispheres
- genus corythosaurus genus of duck-billed dinosaurs of late Cretaceous