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The Triassic formation.

the genus Dicynodon, supporting also a pair of powerful tusks. Their remains are found in triassic strata of South Africa and India.

A small extinct triassic mammal from North Carolina, the earliest yet found in America.

the Ammonites. The earliest forms are found in the Devonian formation, the latest, in the Triassic.

A fossil footprint; as, the ichnites in the Triassic sandstone. Page.

pplied 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 upper division of the European Triassic. See Chart of Geology.

A genus of very large fossil amphibians, of the Triassic period, having bony plates on the under side of the body. It is the type of the order Labyrinthodonta. Called also Mastodonsaurus.

al genus Labyrinthodon, and many other allied forms, from the Carboniferous, Permian, and Triassic formations. By recent writers they are divided into two or more orders. See Stegocephala.

A large extinct genus of labyrinthodonts, found in the European Triassic rocks.

An extinct genus of small Triassic mammals, the oldest yet found in European strata.

A kind of shell limestone, whose strata form the middle one of the three divisions of the Triassic formation in Germany. See Chart, under Geology.

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

xtinct genus of huge vertebrates, probably dinosaurs, known only from four-toed tracks in Triassic sandstones.

Specifically: Of or pertaining to, or characterizing, Triassic and Permian sandstones of red and other colors. [Also written poikilitic.]

A silicified stem of tree fern, found in abundance in the Triassic sandstone.

nging to the 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.

as, certain Mesozoic strata of the Rhetian Alps. These strata are regarded as closing the Triassic period. See the Chart of Geology.

An extinct order of reptiles found in the Permian and Triassic formations in South Africa. In some respects they resembled carnivorous mammals. Called also Theromorpha.