The deep and sheltered nature of the gorge (and its western location) provides a humid microclimate in the ancient woodland and other habitats here which is favourable for bryophytes.
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Many of the geological and topographical features that give character to the north Pennine landscape are beautifully displayed in the 8 kms or so of this valley.

On a walk from Alston, upstream to Nenthead, the excursion will look at typical Carboniferous cyclothemic deposits
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