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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..

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

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

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

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..

Chazy Epoch :: Chazy epoch () An epoch at the close of the Canadian period of the American Lower Silurian system; -- so named from a township in Clinton Co., New York. See the Diagram under Geology..

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..

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

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..

Eophyte :: Eophyte (n.) A fossil plant which is found in the lowest beds of the Silurian age.

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

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

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..

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..

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..

Cliff Limestone :: Cliff limestone () A series of limestone strata found in Ohio and farther west, presenting bluffs along the rivers and valleys, formerly supposed to be of one formation, but now known to be partly Silurian and partly Devonian..

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.

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..

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..

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