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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..

Primordial :: Primordial (a.) Of or pertaining to the lowest beds of the Silurian age, corresponding to the Acadian and Potsdam periods in American geology. It is called also Cambrian, and by many geologists is separated from the Silurian..

Calymene :: Calymene (n.) A genus of trilobites characteristic of the Silurian age.

Atrypa :: Atrypa (n.) A extinct genus of Branchiopoda, very common in Silurian limestones..

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

Cincinnati Epoch :: Cincinnati epoch () An epoch at the close of the American lower Silurian system. The rocks are well developed near Cincinnati, Ohio. The group includes the Hudson River and Lorraine shales of New York..

Taconic :: Taconic (a.) Designating, or pertaining to, the series of rocks forming the Taconic mountains in Western New England. They were once supposed to be older than the Cambrian, but later proved to belong to the Lower Silurian and Cambrian..

Delthyris :: Delthyris (n.) A name formerly given to certain Silurian brachiopod shells of the genus Spirifer.

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..

Eurypterus :: Eurypterus (n.) A genus of extinct Merostomata, found in Silurian rocks. Some of the species are more than three feet long..

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

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

Trinucleus :: Trinucleus (n.) A genus of Lower Silurian trilobites in which the glabella and cheeks form three rounded elevations on the head.

Llandeilo Group :: Llandeilo group () A series of strata in the lower Silurian formations of Great Britain; -- so named from Llandeilo in Southern Wales. See Chart of Geology.

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

Heliolite :: Heliolite (n.) A fossil coral of the genus Heliolites, having twelve-rayed cells. It is found in the Silurian rocks..

Maclurea :: Maclurea (n.) A genus of spiral gastropod shells, often of large size, characteristic of the lower Silurian rocks..

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..

Quebec Group :: Quebec group () The middle of the three groups into which the rocks of the Canadian period have been divided in the American Lower Silurian system. See the Chart of Geology.

Asaphus :: Asaphus (n.) A genus of trilobites found in the Lower Silurian formation. See Illust. in Append.

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