Cynwyd Forest Quarry

Cynwyd Forest Quarry is a Site of Special Scientific Interest located aside a track within the Cynwyd Forest near Corwen, Denbighshire, North Wales.
Sometimes referred to in literature as 'Bwlch y Gaseg' and in very close proximity to the area of the same name. It was described by Rushton et al. and exposes Late Ordovician micaceous siltstones and mudstones of the Dolhir Formation which yields a rich shelly fauna. Trilobites are represented by several genera although the fauna is dominated by Gravicalymene arcuata Price, 1982. Bivalves, bryozoans and various Echinodermata are also present. Examples of most of the fossils listed below are illustrated and briefly described in "Fossils of the Upper Ordovician" by Harper and Owen.

Fossils include

Bryozoa:Pinnatoporella carinata Phylloporina sp.Graptodictya sp.
Brachiopoda:Leptaena sp.
Cephalopoda:Zitteloceras costatum Teichert.
Trilobita:Gravicalymene arcuata PriceIllaenus davisii Remopleurides cf. nicholsoni ReedPseudospaerexochus cf. conformis Pseudospaerexochus octolobatus Calyptaulax sp.Tretaspis sp.
Crinoidea:Cupulocorona rugosa Donovan and Paul
CystoideaRegulaecystis inconstans PaulDendrocystoides sp.