This ancient woodland at the edge of the magnesian limestone and below it is soft trickle of the bubbling Bardsey Beck There are a variety of habitats on this undulating reserve, with towering rocky crags, ancient woodland and calcareous grasslands along the top under restoration with a fine variety of species including marbled White and recently Dark-green Fritillary. Just to the south is Pompacalli of Roman origin composed of sandy heathland and occasional Green Hairstreaks are seen.  

There is extensive coppice and repairs after Ash Dieback claimed many casulaities. Wych elm is common along the edges of the site.  A large  meadow has been created on calcareous soil with  hairy violets so there is hope  the  Dark-green Fritillary will stay.