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Often these volcanic products can be identified by various chemical and non-chemical means and if the eruption date is known, the occurrence of tephra from a given eruption in stratigraphic sequences provides a powerful means of dating such deposits, or of refining available dating schemes.Furthermore, the occurrence of tephra from the same eruption across sites, regions and in various types of depositional contexts (ice-cores, terrestrial, marine, cultural) holds the potential of linking and thus elucidating the tempi and causes of both environmental and cultural change.Volcanic eruptions are often, although by no means always, associated with a profuse output of fine pyroclastic material, tephra.While residence time in the atmosphere of the very finest of these particles can be substantial, the deposition of the bulk of volcanic ejecta can be considered instantaneous from a geological, archaeological, and evolutionary perspective. Dating does not take place on the tephra itself, but on the eruption that produced it.

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Because all dating techniques may be subject to considerable error, reliability should be assessed by stratigraphic consistency between results of different dating methods or of the same method.The presence of unambiguously identified and dated tephra layers can provide a crucial test of other chronological methods (e.g.Dugmore 1995 a and b), as well as providing otherwise unobtainable precise dating of palaeoenvironmental and proxy climate records (e.g. This allows precise correlations to be made between high resolution palaeoenvironmental records within Scotland, across Greenland, the North Atlantic and north-west Europe.Recent years have seen considerable advances in tephrochronology studies, especially regarding the detection of macroscopically invisible micro- or cryptotephras.In parallel with the possibility of detecting hitherto invisible tephras over vastly increased areas, the overall potential of tephrochronology as a major dating tool for both palaeoenvironmental scientists and archaeologists is greatly expanded.

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