Abstract
During the late-glacial eruption of the Laacher See volcano 12,900 b.p. the whole area of the Neuwied Basin, middle Rhine region, was covered by several metres of the Laacher See Tephra (LST) damaging but also partly conserving the former vegetation. This gave the unique opportunity to study plant remains in situ and to estimate the spatial biodiversity of plant taxa within the area investigated at the end of the last glacial as if in a snapshot of 12,900 years ago. Different kinds of plant material can be found because of different preservation conditions namely imprints, charcoal and waterlogged remains. Investigations of this material from several places within the Neuwied Basin and the Brohl valley north of it allowed the reconstruction of the former vegetation at different scales from local to regional. This resulted in a large scale draft of a vegetation map of the studied area also based on the distribution and the stage of soil development at that time. As to whether thermophilous trees were already present is discussed but largely rejected.
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