stratigraphic horizon

См. также в других словарях:

• horizon — /heuh ruy zeuhn/, n. 1. the line or circle that forms the apparent boundary between earth and sky. 2. Astron. a. the small circle of the celestial sphere whose plane is tangent to the earth at the position of a given observer, or the plane of… …   Universalium

• horizon — ho•ri•zon [[t]həˈraɪ zən[/t]] n. 1) astron. the line or circle that forms the apparent boundary between earth and sky 2) astron. a) the small circle of the celestial sphere whose plane is tangent to the earth at the position of a given observer,… …   From formal English to slang

• Marker horizon — Tephra horizons in Iceland Marker horizons or chronohorizons or marker beds are stratigraphic units of the same age and of such distinctive composition and appearance, that, despite their presence in separate geographic locations, there is no… …   Wikipedia

• Archaeological horizon — An archaeological horizon is a widely disseminated period of common art and artifacts at an archaeological site or, more usually, over a larger geographic area, and is a distinctive level in that site s or area s archaeological sequence. [Pool, p …   Wikipedia

• Moon — This article is about Earth s Moon. For moons in general, see Natural satellite. For other uses, see Moon (disambiguation) …   Wikipedia

• Glacier mass balance — See also Retreat of glaciers since 1850 Crucial to the survival of a glacier is its mass balance, the difference between accumulation and ablation (melting and sublimation). Climate change may cause variations in both temperature and snowfall,… …   Wikipedia

• North American Land Mammal Age — The North American Mammal Ages (NALMA) establishes a geologic timescale for prehistoric North American fauna beginning 66.5 Ma during the Paleocene and continuing through to the Late Pleistocene (0.11 Ma). These periods are referred to as ages,… …   Wikipedia

• Development well —   A well drilled within the proved area of an oil or gas reservoir to the depth of a stratigraphic horizon known to be productive. Also see Well.   U.S. Dept. of Energy, Energy Information Administration s Energy Glossary …   Energy terms

• Cambrian — For other uses, see Cambrian (disambiguation). Cambrian Period 542–488.3 million years ago …   Wikipedia

• Silurian Period — Interval of geologic time, 443–417 million years ago. The third period of the Paleozoic Era, the Silurian follows the Ordovician Period and precedes the Devonian. It marks the first appearance of land plants and jawed fishes. The continents were… …   Universalium

• dating — I In geology and archaeology, the process of determining an object s or event s place within a chronological scheme. Scientists may use either relative dating, in which items are sequenced on the basis of stratigraphic clues (see stratigraphy) or …   Universalium