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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..

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

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

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..

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

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

Ordovician :: Ordovician (a.) Of or pertaining to a division of the Silurian formation, corresponding in general to the Lower Silurian of most authors, exclusive of the Cambrian..

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

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.

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

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

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..

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.

Graptolite :: Graptolite (n.) One of numerous species of slender and delicate fossils, of the genus Graptolites and allied genera, found in the Silurian rocks. They belong to an extinct group (Graptolithina) supposed to be hydroids..

Chaetetes :: Chaetetes (n.) A genus of fossil corals, common in the lower Silurian limestones..

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..

Halysites :: Halysites (n.) A genus of Silurian fossil corals; the chain corals. See Chain coral, under Chain..

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

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..

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