Pollen analysis dating

Pollen analysis is also sometimes useful in exploration for resources of fossil fuels.

: the identification and determination of frequency of pollen grains in peat bogs and other preservative situations as a means of dating fossil and other remains : the study of past vegetations and climates as indicated by the pollen content of the various layers of the earth's surface You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

The term was introduced by the French geologist André Combaz in 1964.

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They are extracted from sedimentary rocks and sediment cores both physically, by ultrasonic treatment and wet sieving, and chemically, by chemical digestion to remove the non-organic fraction.

Palynomorphs may be composed of organic material such as chitin, pseudochitin and sporopollenin.

Stratigraphical palynology, a branch of micropalaeontology and paleobotany, studies fossil palynomorphs from the Precambrian to the Holocene.

Palynomorphs are broadly defined as organic-walled microfossils between 5 and 500 micrometres in size.

It is the science that studies contemporary and fossil palynomorphs, including pollen, spores, orbicules, dinocysts, acritarchs, chitinozoans and scolecodonts, together with particulate organic matter (POM) and kerogen found in sedimentary rocks and sediments.

Palynology does not include diatoms, foraminiferans or other organisms with siliceous or calcareous exoskeletons. A classic palynologist analyses particulate samples collected from the air, from water, or from deposits including sediments of any age.Palynomorph microscopic structures that are abundant in most sediments are resistant to routine pollen extraction including strong acids and bases, and acetolysis, or density separation.A palynofacies is the complete assemblage of organic matter and palynomorphs in a fossil deposit.Early investigators include Christian Gottfried Ehrenberg (radiolarians, diatoms and dinoflagellate cysts), Gideon Mantell (desmids) and Henry Hopley White (dinoflagellate cysts). Weber 1918) appear to be among the first to undertake 'percentage frequency' calculations.Quantitative analysis of pollen began with Lennart von Post's published work. The term palynology was introduced by Hyde and Williams in 1944, following correspondence with the Swedish geologist Ernst Antevs, in the pages of the Pollen Analysis Circular (one of the first journals devoted to pollen analysis, produced by Paul Sears in North America).Pollen analysis advanced rapidly in this period due to advances in optics and computers.

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