permil
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Δ¹³C — In geochemistry, paleoclimatology and paleoceanography δ13C is a measure of the ratio of stable isotopes 13C:12C, reported in parts per thousand (per mil, permil;).The definition is δ13C (in per mil) = 103 [(Rsample/Rstandard) 1] , where Rx =… … Wikipedia
Isotope analysis — is the identification of isotopic signature, the distribution of certain stable isotopes and chemical elements within chemical compounds. This can be applied to a food web to make it possible to draw direct inferences regarding diet, trophic… … Wikipedia
Per mil — ‰ Per mil Punctuation apostrophe ( ’ … Wikipedia
Δ18O — In geochemistry, paleoclimatology and paleoceanography δ18O is a measure of the ratio of stable isotopes 18O:16O. The definition is δ18O (in per mil) = 103 [(Rsample/Rstandard) 1] , where Rx = (18O)/(16O) is the ratio of isotopic composition of a … Wikipedia
Spongiophyton — was a thallose fossil of the early to mid Devonian, which is notoriously difficult to classify.Affinity Spongiophyton has been mistakenly interpreted as tree resin [Penhallow (1889) in Fletcher (2004)] and lycopod cuticle, [Barbosa (1949) in… … Wikipedia
Early Cambrian geochemical fluctuations — The start of the Cambrian period is marked by fluctuations in a number of geochemical records, including Strontium, Sulfur and Carbon isotopic excursions. While these anomolies are difficult to interpret, a number of possibilities have been put… … Wikipedia
Caracteres especiales — Ayuda:Caracteres especiales Saltar a navegación, búsqueda Para una versión más actualizada (en obras), ver meta:Ayuda:Caracteres especiales. A partir de la versión 1.5 de MediaWiki, todos los proyectos usan la codificación de caracteres Unicode… … Wikipedia Español
Snowball Earth — The Snowball Earth hypothesis as it was originally proposedcite book author = Kirschvink, J.L. year = 1992 chapter = Late Proterozoic low latitude global glaciation: The snowball Earth title = The Proterozoic Biosphere: A Multidisciplinary Study… … Wikipedia
Percent sign — % Percent sign Punctuation apostrophe ( ’ … Wikipedia
Percentage point — Percentage points (pp) are the unit for the arithmetic difference of two percentages. Consider the following hypothetical example: in 1980, 40 percent of the population smoked, and in 1990 only 30 percent smoked. We can thus say that from 1980 to … Wikipedia
