Cors Gyfelog occupies a 68.2-hectare basin in the northern Llŷn Peninsula that began as a shallow lake immediately after the last ice age and rapidly infilled with peat in the early Holocene. Pollen and peat-stratigraphy studies show that during the Atlantic period the site expanded as a rich fen, then alternated between poor fen and alder carr woodland throughout much of the mid-Holocene. In the sub-Atlantic phase, reedswamp and early valley-bog communities developed before succession stabilised as sedge-dominated fen. More recent attempts at drainage have lowered water levels, allowing Molinia grass and willow scrub to invade drier patches. Continued monitoring, removal of invading scrub and careful water-level management are recommended to maintain its characteristic mesotrophic mire habitats.[2]
↑ Botterill, Elizabeth Mary (1988). A Palaeoecological Study of Cors Gyfelog and Tre'r Gof: Lowland Mires in North West Wales (PhD thesis). University of Keele.
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