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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.

In order to move towards such integration, a series of methodological challenges have to be met.

tephrochronology absolute dating-87

Correlation of tephra deposits generally relies on accurate grain specific chemical analysis of major and minor elements.

Geologic assessment of active tectonism depends on two key measures: the age and the amount of deformation of a given stratigraphic unit.

The amount of deformation can normally be measured with greater accuracy than the age.

The aim of this paper is not to be comprehensive, but to provide a brief and timely general review of tephra studies and their methodologies, and to make a case for better linking tephra research to archaeology, all from a primarily Scandinavian perspective.

We argue that the identification of tephra in archaeological sediments should, in due time, become as routine as other types of geo-archaeological analyses, especially given that tephra cannot only act as a useful chronostratigraphic marker, but can also play a role in changing patterns of environmental and cultural change at the level of the site or the region.

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