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Permian :: Permian (a.) Belonging or relating to the period, and also to the formation, next following the Carboniferous, and regarded as closing the Carboniferous age and Paleozoic era..

Paleozoic :: Paleozoic (a.) Of or pertaining to, or designating, the older division of geological time during which life is known to have existed, including the Silurian, Devonian, and Carboniferous ages, and also to the life or rocks of those ages. See Chart of Geology..

Silurian :: Silurian (a.) Of or pertaining to the country of the ancient Silures; -- a term applied to the earliest of the Paleozoic eras, and also to the strata of the era, because most plainly developed in that country..

Tentaculite :: Tentaculite (n.) Any one of numerous species of small, conical fossil shells found in Paleozoic rocks. They are supposed to be pteropods..

Eozoic :: Eozoic (a.) Of or pertaining to rocks or strata older than the Paleozoic, in many of which the eozoon has been found..

Rugosa :: Rugosa (n. pl.) An extinct tribe of fossil corals, including numerous species, many of them of large size. They are characteristic of the Paleozoic formations. The radiating septs, when present, are usually in multiples of four. See Cyathophylloid..

Eurypteroidea :: Eurypteroidea (n. pl.) An extinct order of Merostomata, of which the genus Eurypterus is the type. They are found only in Paleozoic rocks..

Archaeozoic :: Archaeozoic (a.) Like or belonging to the earliest forms of animal life.

Pentamerus :: Pentamerus (n.) A genus of extinct Paleozoic brachiopods, often very abundant in the Upper Silurian..

Zaphrentis :: Zaphrentis (n.) An extinct genus of cyathophylloid corals common in the Paleozoic formations. It is cup-shaped with numerous septa, and with a deep pit in one side of the cup..

Archaean :: Archaean (n.) The earliest period in geological period, extending up to the Lower Silurian. It includes an Azoic age, previous to the appearance of life, and an Eozoic age, including the earliest forms of life..

Cyathophylloid :: Cyathophylloid (n.) A fossil coral of the family Cyathophyllidae; sometimes extended to fossil corals of other related families belonging to the group Rugosa; -- also called cup corals. Thay are found in paleozoic rocks.

Neozoic :: Neozoic (a.) More recent than the Paleozoic, -- that is, including the Mesozoic and Cenozoic..

Paleozoology :: Paleozoology (n.) The Paleozoic time or strata.

Cystidea :: Cystidea (n. pl.) An order of Crinoidea, mostly fossils of the Paleozoic rocks. They were usually roundish or egg-shaped, and often unsymmetrical; some were sessile, others had short stems..

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..

Paleocrinoidea :: Paleocrinoidea (n. pl.) A suborder of Crinoidea found chiefly in the Paleozoic rocks.

Blastoidea :: Blastoidea (n. pl.) One of the divisions of Crinoidea found fossil in paleozoic rocks; pentremites. They are so named on account of their budlike form.

Orthis :: Orthis (n.) An extinct genus of Brachiopoda, abundant in the Paleozoic rocks..

Teleozoic :: Teleozoic (a.) Having tissued composed of cells.

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