horizon marker

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• 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

• Kansan Glacial Stage — ▪ geology       major division of Pleistocene deposits and time in North America (the Pleistocene Epoch began about 2,500,000 years ago and ended about 10,000 years ago). The Kansan glaciation followed the Aftonian Interglacial Stage and preceded …   Universalium

• Tapinocephalus — ▪ paleontology       extinct genus of therapsids, relatives of mammals, found as fossils in Permian rocks of South Africa (the Permian Period occurred from 299 million to 251 million years ago). The genus Tapinocephalus is representative of the… …   Universalium

• маркирующий горизонт — — [http://slovarionline.ru/anglo russkiy slovar neftegazovoy promyishlennosti/] Тематики нефтегазовая промышленность EN datum bedhorizon markerindicator bedkey rockreference bedstructure indicator …   Справочник технического переводчика

• NABATEANS — NABATEANS, ancient people in the Middle East. Originally a pastoral, nomadic people, the Nabateans became merchants in the trade of oils, aromatics and spices, frankincense and myrrh from southern Arabia. By the second century B.C.E., they… …   Encyclopedia of Judaism

• Celestial navigation — Celestial navigation, also known as astronavigation, is a position fixing technique that was devised to help sailors cross the featureless oceans without having to rely on dead reckoning to enable them to strike land. Celestial navigation uses… …   Wikipedia

• Geochronology — A schematic depiction of the major events in the history of our planet. Geochronology is the science of determining the age of rocks, fossils, and sediments, within a certain degree of uncertainty inherent to the method used. A variety of dating… …   Wikipedia

• Aubrey holes — The Aubrey holes are a ring of 56 pits at Stonehenge named after the seventeenth century antiquarian, John Aubrey. They date to the earliest phases of Stonehenge in the late fourth and early third millennium BC. Despite decades of argument and… …   Wikipedia

• Kurgan hypothesis — The Kurgan hypothesis (also theory or model) is a model of early Indo European origins, which postulates that the Kurgan culture of the Pontic steppe were the most likely speakers of the reconstructed Proto Indo European language. Though… …   Wikipedia

• soil — soil1 soilless, adj. /soyl/, n. 1. the portion of the earth s surface consisting of disintegrated rock and humus. 2. a particular kind of earth: sandy soil. 3. the ground as producing vegetation or as cultivated for its crops: fertile soil. 4. a… …   Universalium

• pre-Columbian civilizations — Introduction       the aboriginal American Indian (Mesoamerican Indian) cultures that evolved in Meso America (part of Mexico and Central America) and the Andean region (western South America) prior to Spanish exploration and conquest in the 16th …   Universalium