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Chronogram :: Chronogram (n.) An inscription in which certain numeral letters, made to appear specially conspicuous, on being added together, express a particular date or epoch, as in the motto of a medal struck by Gustavus Adolphus in 1632: ChrIstVs DVX; ergo trIVMphVs.- the capitals of which give, when added as numerals, the sum 1632..

Hamilton Period :: Hamilton period () A subdivision of the Devonian system of America; -- so named from Hamilton, Madison Co., New York. It includes the Marcellus, Hamilton, and Genesee epochs or groups. See the Chart of Geology..

Era :: Era (n.) A period of time in which a new order of things prevails; a signal stage of history; an epoch.

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..

Score :: Score (n.) To mark with parallel lines or scratches; as, the rocks of New England and the Western States were scored in the drift epoch..

Epi- :: Epi- () A prefix, meaning upon, beside, among, on the outside, above, over. It becomes ep-before a vowel, as in epoch, and eph-before a Greek aspirate, as in ephemeral..

Genesee Epoch :: Genesee epoch () The closing subdivision of the Hamilton period in the American Devonian system; -- so called because the formations of this period crop out in Genesee, New York..

Epoch :: Epoch (n.) A division of time characterized by the prevalence of similar conditions of the earth; commonly a minor division or part of a period.

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..

Accession :: Accession (n.) The act of coming to or reaching a throne, an office, or dignity; as, the accession of the house of Stuart; -- applied especially to the epoch of a new dynasty..

Era :: Era (n.) A fixed point of time, usually an epoch, from which a series of years is reckoned..

Epoch :: Epoch (n.) The date at which a planet or comet has a longitude or position.

Archaeology :: Archaeology (n.) The science or study of antiquities, esp. prehistoric antiquities, such as the remains of buildings or monuments of an early epoch, inscriptions, implements, and other relics, written manuscripts, etc..

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..

Fauna :: Fauna (n.) The animals of any given area or epoch; as, the fauna of America; fossil fauna; recent fauna..

Epocha :: Epocha (n.) See Epoch.

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..

Renaissance :: Renaissance (n.) The style of art which prevailed at this epoch.

Pleistocene :: Pleistocene (a.) Of or pertaining to the epoch, or the deposits, following the Tertiary, and immediately preceding man..

Era :: Era (n.) A period of time reckoned from some particular date or epoch; a succession of years dating from some important event; as, the era of Alexander; the era of Christ, or the Christian era (see under Christian)..

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