Not a visible tephra layer: cryptotephra. 26–32 cm depth in the core. Colourless, pumiceous and highly vesicular glass shards, the median diameter of the shards being 30 microns. Even shards <20 microns in diameter are highly vesicular with micrometre-thin bubble walls.
Linking the North Atlantic to central Europe: A high-resolution Holocene tephrochronological record from northern Germany
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