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Ichthyosaurus :: Ichthyosaurus (n.) An extinct genus of marine reptiles; -- so named from their short, biconcave vertebrae, resembling those of fishes. Several species, varying in length from ten to thirty feet, are known from the Liassic, Oolitic, and Cretaceous formations..

Supercurious :: Supercretaceous (a.) Same as Supracretaceous.

Lituite :: Lituite (n.) Any species of ammonites of the genus Lituites. They are found in the Cretaceous formation.

Gault :: Gault (n.) A series of beds of clay and marl in the South of England, between the upper and lower greensand of the Cretaceous period..

Mosasauria :: Mosasauria (n. pl.) An order of large, extinct, marine reptiles, found in the Cretaceous rocks, especially in America. They were serpentlike in form and in having loosely articulated and dilatable jaws, with large recurved tteth, but they had paddlelike feet. Some of them were over fifty feet long. They are, essentially, fossil sea serpents with paddles. Called also Pythonomarpha, and Mosasauria..

Liriodendron :: Liriodendron (n.) A genus of large and very beautiful trees of North America, having smooth, shining leaves, and handsome, tuliplike flowers; tulip tree; whitewood; -- called also canoewood. Liriodendron tulipifera is the only extant species, but there were several others in the Cretaceous epoch..

Neocomian :: Neocomian (n.) A term applied to the lowest deposits of the Cretaceous or chalk formation of Europe, being the lower greensand..

Laelaps :: Laelaps (n.) A genus of huge, carnivorous, dinosaurian reptiles from the Cretaceous formation of the United States. They had very large hind legs and tail, and are supposed to have been bipedal. Some of the species were about eighteen feet high..

Ichthyornis :: Ichthyornis (n.) An extinct genus of toothed birds found in the American Cretaceous formation. It is remarkable for having biconcave vertebrae, and sharp, conical teeth set in sockets. Its wings were well developed. It is the type of the order Odontotormae..

Enchodus :: Enchodus (n.) A genus of extinct Cretaceous fishes; -- so named from their spear-shaped teeth. They were allied to the pike (Esox).

Mosasaurus :: Mosasaurus (n.) A genus of extinct marine reptiles allied to the lizards, but having the body much elongated, and the limbs in the form of paddles. The first known species, nearly fifty feet in length, was discovered in Cretaceous beds near Maestricht, in the Netherlands..

Pteranodon :: Pteranodon (n.) A genus of American Cretaceous pterodactyls destitute of teeth. Several species are known, some of which had an expanse of wings of twenty feet or more..

Baculite :: Baculite (n.) A cephalopod of the extinct genus Baculites, found fossil in the Cretaceous rocks. It is like an uncoiled ammonite..

Elasmosaurus :: Elasmosaurus (n.) An extinct, long-necked, marine, cretaceous reptile from Kansas, allied to Plesiosaurus..

Gryphaea :: Gryphaea (n.) A genus of cretaceous fossil shells allied to the oyster.

Senonian :: Senonian (a.) In european geology, a name given to the middle division of the Upper Cretaceous formation..

Dakota Group :: Dakota group () A subdivision at the base of the cretaceous formation in Western North America; -- so named from the region where the strata were first studied.

Turonian :: Turonian (n.) One of the subdivisions into which the Upper Cretaceous formation of Europe is divided.

Exogyra :: Exogyra (n.) A genus of Cretaceous fossil shells allied to oysters.

Laramie Group :: Laramie group () An extensive series of strata, principally developed in the Rocky Mountain region, as in the Laramie Mountains, and formerly supposed to be of the Tertiary age, but now generally regarded as Cretaceous, or of intermediate and transitional character. It contains beds of lignite, often valuable for coal, and is hence also called the lignitic group. See Chart of Geology..

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