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The Jurassic period or formation; -- called also the Jura.

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

o the sepia, and belonging to an extinct family. The belemnites are found in rocks of the Jurassic and Cretaceous ages. -- Bel*em*nit"ic, a.

A genus of American jurassic dinosaurs. A length of sixty feet is believed to have been attained by these reptiles.

A genus of gigantic American Jurassic dinosaurs, having large cavities in the bodies of the dorsal vertebræ.

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.

A genus of Dinosauria found in the Jurassic formation, and remarkable for having several birdlike features.

Of, pertaining to, or designating, the period of time following the Jurassic and preceding the Eocene.

The Jurassic period. See Jurassic.

A term applied to many American Mesozoic strata, in which the characteristics of the Jurassic and Triassic periods appear to be blended. -- Ju`ra-tri*as"sic, a.

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 Oölite. See the Chart of Geology.

An extinct genus of large herbivorous dinosaurs, found in Jurassic strata in America.

resembling the roe of a fish. It sometimes constitutes extensive beds, as in the European Jurassic. See the Chart of Geology.

he reptiles. Reptilian age (Geol.), that part of geological time comprising the Triassic, Jurassic, and Cretaceous periods, and distinguished as that era in which the class of reptiles attained its highest expansion; -- called also the Secondary or Mezozoic age.

A genus of large Jurassic dinosaurs remarkable for a powerful dermal armature of plates and spines.

A genus of extinct crocodilian reptiles of the Jurassic period, having a long and slender snout.