Article: Trilobites from the Gorran Quartzites, Ordovician of south Cornwall

The Llandeilo age of the Gorran Quartzites of south Cornwall and the Armorican affinities of the faunas suggested by some earlier authors are confirmed by a study of existing collections and material from two new localities. Revised descriptions and illustrations are given for species of Neseuretus and Kloucekia found in the quartzites of Veryan Bay and Gorran Haven. The presence of a species of Bathycheilus is recorded from there, with additional trinucleid and ogygiocaridinid material. A new species of Crozonaspis, a genus known from the Llandeilo of the Armorican Massif, Spain and Morocco, is described from the quartzites in Gerrans Bay. Since the deformation of the fossils is relatively slight, some primary vatiation within Nesueretus (N.) tristani seems to be demonstrable.