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Radiocarbon Dating of Shells and Foraminifera from the Skagen Core, Denmark: Evidence of Reworking

  • Susanne Heier-Nielsen (a1) (a2), Keld Conradsen (a1), Jan Heinemeier (a2), K. L. Knudsen (a1), H. L. Nielsen (a2), Niels Rud (a2) and Á. E. Sveinbjörnsdóttir (a3)...

Abstract

We report on 69 radiocarbon dates of mollusk shells and benthic foraminifera from the upper 132 m of the marine shelf sediments of the Skagen Core (220 m total length). The dated sequence covers the Late Glacial and the Holocene (from 15 ka bp to Recent). Sedimentation rates range from 1 to 70 m ka−1. The macrofossil shell dates follow a smooth curve constituting an age model for dating the sediments. The foraminiferal dates fall into two groups: those that agree exactly with the mollusk shells and those that deviate substantially, always being older than the shells by as much as 5 ka. One mixed foraminiferal sample consisted of members from both groups, and as a result, the age deviation of the sample turned out to be some weighted average. The data indicate that the age deviations are due to admixtures of reworked older foraminifera.

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References

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