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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.

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..

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..

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

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..

Chemung Period :: Chemung period () A subdivision in the upper part of the Devonian system in America, so named from the Chemung River, along which the rocks are well developed. It includes the Portage and Chemung groups or epochs. See the Diagram under Geology..

Horizon :: Horizon (n.) The epoch or time during which a deposit was made.

Liriodendron :: Liriodendron (n.) A genus of large and very beautiful trees of North America, having smooth, shining leaves, and handsome, tuliplike flowers; tulip tree; whitewood; -- called also canoewood. Liriodendron tulipifera is the only extant species, but there were several others in the Cretaceous epoch..

Diluvial :: Diluvial (a.) Effected or produced by a flood or deluge of water; -- said of coarse and imperfectly stratified deposits along ancient or existing water courses. Similar unstratified deposits were formed by the agency of ice. The time of deposition has been called the Diluvian epoch.

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

Epoch :: Epoch (n.) An arbitrary fixed date, for which the elements used in computing the place of a planet, or other heavenly body, at any other date, are given; as, the epoch of Mars; lunar elements for the epoch March 1st, 1860..

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..

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..

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..

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)..

Pleistocene :: Pleistocene (n.) The Pleistocene epoch, or deposits..

Recent :: Recent (a.) Of or pertaining to the present or existing epoch; as, recent shells..

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..

Epocha :: Epocha (n.) See Epoch.

Date :: Date (n.) The point of time at which a transaction or event takes place, or is appointed to take place; a given point of time; epoch; as, the date of a battle..

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