isotopic spike

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• 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

• mass spectrometry — or mass spectroscopy Analytic technique by which chemical substances are identified by sorting gaseous ions by mass using electric and magnetic fields. A mass spectrometer uses electrical means to detect the sorted ions, while a mass spectrograph …   Universalium

• Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry       The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …   Universalium

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• Isotopes of calcium — Calcium (Ca) has four stable isotopes (40Ca and 42Ca through 44Ca), plus two more isotopes (46Ca and 48Ca) that have such long half lives that for all practical purposes they can be considered stable. It also has a cosmogenic isotope, radioactive …   Wikipedia

• Thomas Edvard Krogh — Thomas Edvard Tom Krogh, FRSC (1936 ndash; April 29, 2008) was a geochronologist and a former curator for the Royal Ontario Museum. He revolutionized the technique of radiometric uranium lead dating with the development of new laboratory… …   Wikipedia

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• 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

• Late Heavy Bombardment — The Late Heavy Bombardment (commonly referred to as the lunar cataclysm, or LHB) is a period of time approximately 3,800 to 4,100 million years ago (mya) during which a large number of impact craters are believed to have formed on the Moon, and… …   Wikipedia

• Osteoderm — Osteoderme des ausgestorbenen Krokodils Deinosuchus Als Osteoderme (von altgriechisch ὀστέον ostéon ‚Knochen‘ und δέρμα dérma ‚Haut‘),[1] Osteodermata oder Hautknochenplat …   Deutsch Wikipedia