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Jurassic :: "Jurassic (a.) Of the age of the middle Mesozoic, including, as divided in England and Europe, the Lias, Oolite, and Wealden; -- named from certain rocks of the Jura mountains..

Steik :: Stegosaurus (n.) A genus of large Jurassic dinosaurs remarkable for a powerful dermal armature of plates and spines.

Lias :: Lias (n.) The lowest of the three divisions of the Jurassic period; a name given in England and Europe to a series of marine limestones underlying the Oolite. See the Chart of Geology.

Archaeopteryx :: Archaeopteryx (n.) A fossil bird, of the Jurassic period, remarkable for having a long tapering tail of many vertebrae with feathers along each side, and jaws armed with teeth, with other reptilian characteristics..

Ceratosaurus :: Ceratosaurus (n.) A carnivorous American Jurassic dinosaur allied to the European Megalosaurus. The animal was nearly twenty feet in length, and the skull bears a bony horn core on the united nasal bones. See Illustration in Appendix..

Compsognathus :: Compsognathus (n.) A genus of Dinosauria found in the Jurassic formation, and remarkable for having several birdlike features..

Belemnite :: Belemnite (n.) A conical calcareous fossil, tapering to a point at the lower extremity, with a conical cavity at the other end, where it is ordinarily broken; but when perfect it contains a small chambered cone, called the phragmocone, prolonged, on one side, into a delicate concave blade; the thunderstone. It is the internal shell of a cephalopod related to the sepia, and belonging to an extinct family. The belemnites are found in rocks of the Jurassic and Cretaceous ages..

Jura-trias :: "Jura-trias (n.) A term applied to many American Mesozoic strata, in which the characteristics of the Jurassic and Triassic periods appear to be blended..

Jurassic :: Jurassic (n.) The Jurassic period or formation; -- called also the Jura.

Oolite :: Oolite (n.) A variety of limestone, consisting of small round grains, resembling the roe of a fish. It sometimes constitutes extensive beds, as in the European Jurassic. See the Chart of Geology..

Jura :: Jura (n.) The Jurassic period. See Jurassic.

Camarasaurus :: Camarasaurus (n.) A genus of gigantic American Jurassic dinosaurs, having large cavities in the bodies of the dorsal vertebrae..

Brontosaurus :: Brontosaurus (n.) A genus of American jurassic dinosaurs. A length of sixty feet is believed to have been attained by these reptiles.

Morosaurus :: Morosaurus (n.) An extinct genus of large herbivorous dinosaurs, found in Jurassic strata in America..

Teleosaurus :: Teleosaurus (n.) A genus of extinct crocodilian reptiles of the Jurassic period, having a long and slender snout..

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