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Inoceramus :: Inoceramus (n.) An extinct genus of large, fossil, bivalve shells,allied to the mussels. The genus is characteristic of the Cretaceous period..

Cretaceous :: Cretaceous (a.) Having the qualities of chalk; abounding with chalk; chalky; as, cretaceous rocks and formations. See Chalk..

Parkeria :: Parkeria (n.) A genus of large arenaceous fossil Foraminifera found in the Cretaceous rocks. The species are globular, or nearly so, and are of all sizes up to that of a tennis ball..

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..

Ichthyosauria :: Ichthyosauria (n. pl.) An extinct order of marine reptiles, including Ichthyosaurus and allied forms; -- called also Ichthyopterygia. They have not been found later than the Cretaceous period..

Rudistes :: Rudistes (n. pl.) An extinct order or suborder of bivalve mollusks characteristic of the Cretaceous period; -- called also Rudista. See Illust. under Hippurite.

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

Colorado Group :: Colorado group () A subdivision of the cretaceous formation of western North America, especially developed in Colorado and the upper Missouri region..

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

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..

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..

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

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..

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

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

Cretose :: Cretose (a.) Chalky; cretaceous.

Wealden :: Wealden (a.) Of or pertaining to the lowest division of the Cretaceous formation in England and on the Continent, which overlies the Oolitic series..

Hippurite :: Hippurite (n.) A fossil bivalve mollusk of the genus Hippurites, of many species, having a conical, cup-shaped under valve, with a flattish upper valve or lid. Hippurites are found only in the Cretaceous rocks..

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

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..

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