Tyfry Beds

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Journal Article
Published: 01 February 1979
Journal of the Geological Society (1979) 136 (1): 61–64.
... Stack Group has suggested that they might be better interpreted as dewatering structures, because they are generally confined to single units and often terminate at bedding planes. They are usually normal to bed- ding, but sometimes follow the course of oblique. joints. Furthermore, none...
Journal Article
Published: 01 August 1979
Journal of the Geological Society (1979) 136 (4): 407–432.
... by Greenly into 6 units (Figs. 1, 2 ~ ) : 1 , Fydlyn Group; 2, Gwna Group; 3, Skerries Group (including Church Bay Tuffs and the Tyfry Beds); 4, New Harbour Group; 5 , South Stack Series; 6, Holyhead Quartzite. Of these units, the Fydlyn Group (1) was regarded by Greenly as the oldest unit and the Holyhead...