3451: Wavelength dispersive, microprobe-determined abundances of major elements of colourless glass tephra shards from the Sluggan bog AD upper layer. Those samples, representing anomalous tephra types, marked with an asterisk are not included in the mean * Total oxides by stoichiometry. *

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3461: Wavelength dispersive, microprobe-determined abundances of major elements of colourless glass tephra shards from the Sluggan bog AD middle layer. Those samples, representing anomalous tephra types, marked with an asterisk are not included in the mean * Total oxides by stoichiometry. *

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3471: Wavelength dispersive, microprobe-determined abundances of major elements of colourless glass tephra shards from the Sluggan bog AD lower layer. The samples have been divided into two distinct populations * Total oxides by stoichiometry. *

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3481: Wavelength dispersive, microprobe-determined abundances of major elements of colourless glass tephra shards from the Hekla 4 layer. Published analyses from the Hekla 4 type site in Iceland are included for comparison * Total oxides by stoichiometry. *

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