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Utica :: Utica (a.) Of, pertaining to, or designating, a subdivision of the Trenton Period of the Lower Silurian, characterized in the State of New York by beds of shale..

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

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

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

Silurian :: Silurian (n.) The Silurian age.

Nidulite :: Nidulite (n.) A Silurian fossil, formerly supposed to consist of eggs..

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..

Tilestone :: Tilestone (n.) A kind of laminated shale or sandstone belonging to some of the layers of the Upper Silurian.

Trenton Period :: Trenton period () A subdivision in the lower Silurian system of America; -- so named from Trenton Falls, in New York. The rocks are mostly limestones, and the period is divided into the Trenton, Utica, and Cincinnati epochs. See the Chart of Geology..

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..

Salina Period :: Salina period () The period in which the American Upper Silurian system, containing the brine-producing rocks of central New York, was formed. See the Chart of Geology..

Medina Epoch :: Medina epoch () A subdivision of the Niagara period in the American upper Silurian, characterized by the formations known as the Oneida conglomerate, and the Medina sandstone. See the Chart of Geology..

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..

Cambrian :: Cambrian (a.) Of or pertaining to the lowest subdivision of the rocks of the Silurian or Molluscan age; -- sometimes described as inferior to the Silurian. It is named from its development in Cambria or Wales. See the Diagram under Geology.

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

Niagara Period :: Niagara period () A subdivision or the American Upper Silurian system, embracing the Medina, Clinton, and Niagara epoch. The rocks of the Niagara epoch, mostly limestones, are extensively distributed, and at Niagara Falls consist of about eighty feet of shale supporting a greater thickness of limestone, which is gradually undermined by the removal of the shale. See Chart of Geology..

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

Oriskany :: Oriskany (a.) Designating, or pertaining to, certain beds, chiefly limestone, characteristic of the latest period of the Silurian age..

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

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

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