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Catskill Period :: Catskill period () The closing subdivision of the Devonian age in America. The rocks of this period are well developed in the Catskill mountains, and extend south and west under the Carboniferous formation. See the Diagram under Geology..

Goniatite :: Goniatite (n.) One of an extinct genus of fossil cephalopods, allied to the Ammonites. The earliest forms are found in the Devonian formation, the latest, in the Triassic..

Schoharie Grit :: Schoharie grit () The formation belonging to the middle of the three subdivisions of the Corniferous period in the American Devonian system; -- so called from Schoharie, in New York, where it occurs. See the Chart of Geology..

Lepidodendron :: Lepidodendron (n.) A genus of fossil trees of the Devonian and Carboniferous ages, having the exterior marked with scars, mostly in quincunx order, produced by the separation of the leafstalks..

Trilobite :: Trilobite (n.) Any one of numerous species of extinct arthropods belonging to the order Trilobita. Trilobites were very common in the Silurian and Devonian periods, but became extinct at the close of the Paleozoic. So named from the three lobes usually seen on each segment..

Neuropteris :: Neuropteris (n.) An extensive genus of fossil ferns, of which species have been found from the Devonian to the Triassic formation..

Bovey Coal :: Bovey coal () A kind of mineral coal, or brown lignite, burning with a weak flame, and generally a disagreeable odor; -- found at Bovey Tracey, Devonshire, England. It is of geological age of the oolite, and not of the true coal era..

Gyracanthus :: Gyracanthus (n.) A genus of fossil fishes, found in Devonian and carboniferous strata; -- so named from their round, sculptured spines..

Devon :: Devon (n.) One of a breed of hardy cattle originating in the country of Devon, England. Those of pure blood have a deep red color. The small, longhorned variety, called North Devons, is distinguished by the superiority of its working oxen..

Coccosteus :: Coccosteus (n.) An extinct genus of Devonian ganoid fishes, having the broad plates about the head studded with berrylike tubercles..

Devonian :: Devonian (n.) The Devonian age or formation.

Cliff Limestone :: Cliff limestone () A series of limestone strata found in Ohio and farther west, presenting bluffs along the rivers and valleys, formerly supposed to be of one formation, but now known to be partly Silurian and partly Devonian..

Dalmania :: Dalmania (n.) A genus of trilobites, of many species, common in the Upper Silurian and Devonian rocks..

Devonian :: Devonian (a.) Of or pertaining to Devon or Devonshire in England; as, the Devonian rocks, period, or system..

Cephalaspis :: Cephalaspis (n.) A genus of fossil ganoid fishes found in the old red sandstone or Devonian formation. The head is large, and protected by a broad shield-shaped helmet prolonged behind into two lateral points..

Chemung Period :: Chemung period () A subdivision in the upper part of the Devonian system in America, so named from the Chemung River, along which the rocks are well developed. It includes the Portage and Chemung groups or epochs. See the Diagram under Geology..

Pterichthys :: Pterichthys (n.) A genus of Devonian fossil fishes with winglike appendages. The head and most of the body were covered with large bony plates. See Placodermi.

Corniferous :: Corniferous (a.) Of or pertaining to the lowest period of the Devonian age. (See the Diagram, under Geology.) The Corniferous period has been so called from the numerous seams of hornstone which characterize the later part of the period, as developed in the State of New York..

Hamilton Period :: Hamilton period () A subdivision of the Devonian system of America; -- so named from Hamilton, Madison Co., New York. It includes the Marcellus, Hamilton, and Genesee epochs or groups. See the Chart of Geology..

Dinichthys :: Dinichthys (n.) A genus of large extinct Devonian ganoid fishes. In some parts of Ohio remains of the Dinichthys are abundant, indicating animals twenty feet in length..

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