Abstract
[RAISED bogs are cushion-shaped accumulations of peat, formed mainly by the growth of Sphagnum moss. They are limited to regions with specific rainfall and evaporation conditions, and the bulk of the bog obtains no water other than that reaching it directly from the air. They are often found to have developed from a lake centre, which has become overgrown with fen peat, and then the acid Sphagnum peat has formed. Since the primary lakes are frequently of glacial origin, raised bogs have generally proved to be extremely satisfactory sources of long continuous profiles illustrative of postglacial forest and climatic history. They have been freely exploited by Scandinavian pollen analysts, and it was in search of similarly satisfactory bogs that Tregaron was visited in I936. Raised bogs are very rare in southern England and the Midlands, although they begin to be comparatively abundant on the Welsh border, in Shrop-
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