Abstract
Nd model ages of Windermere Supergroup sediments increase from the upper Ashgill to the upper Ludlow. Below the lower Llandovery, increasing t DM reflects mixing between the underlying Borrowdale Volcanic Group and hemipelagic detritus, possibly sourced from the Lauren-tian margin. The ongoing rise of t DM into the upper Ludlow probably reflects the growing influence of sediment sourced from the Scandian Orogen. A Pøiadoli drop in t DM is interpreted as recording the re-establishment of supply from the local Laurentian margin: north to south sediment dispersal indicating the effective demise of the Iapetus Ocean as a barrier to sediment dispersal.
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