"Devonian" is a word in ENGLISH

The closing subdivision of the Devonian age in America. The rocks of this period are well developed in the Catskill …

A plume-shaped fossil, supposed to be a seaweed, characteristic of the lower Devonian rocks; as, the cauda galli grit.

A genus of fossil ganoid fishes found in the old red sandstone or Devonian formation. The head is large, and …

A subdivision in the upper part of the Devonian system in America, so named from the Chemung River, along which …

A series of limestone strata found in Ohio and farther west, presenting bluffs along the rivers and valleys, formerly supposed …

An extinct genus of Devonian ganoid fishes, having the broad plates about the head studded with berrylike tubercles.

Of or pertaining to the lowest period of the Devonian age. (See the Diagram, under Geology.) The Corniferous period has …

A genus of trilobites, of many species, common in the Upper Silurian and Devonian rocks.

A genus of large extinct Devonian ganoid fishes. In some parts of Ohio remains of the Dinichthys are abundant, indicating …

A genus of fossil corals abundant in the Silurian and Devonian rocks, having polygonal cells with perforated walls.

The closing subdivision of the Hamilton period in the American Devonian system; -- so called because the formations of this …

One of an extinct genus of fossil cephalopods, allied to the Ammonites. The earliest forms are found in the Devonian …

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

A subdivision of the Devonian system of America; -- so named from Hamilton, Madison Co., New York. It includes the …

A genus of fossil trees of the Devonian and Carboniferous ages, having the exterior marked with scars, mostly in quincunx …

An extensive genus of fossil ferns, of which species have been found from the Devonian to the Triassic formation.

Of or pertaining to, or designating, the older division of geological time during which life is known to have existed, …

A genus of trilobites found in the Silurian and Devonian formations. Phacops bufo is one of the most common species.

A genus of Devonian fossil fishes with winglike appendages. The head and most of the body were covered with large …

The formation belonging to the middle of the three subdivisions of the Corniferous period in the American Devonian system; -- …