On the Sliding or Slumping of Submarine Sediments in Denbighshire, North Wales, during the Ludlow Period

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Abstract
In a paper published by the Liverpool Geological Society in 1932, Professor P. G. H. Boswell directed attention to an area in the neighbourhood of Llangerniew in north-western Denbighshire wherein structures of great geological interest are exhibited. The area forms part of the Denbighshire Moors, the geology of which has been described by the same author and others (Boswell 1926, 1928 a, b, 1932, 1935 a, b; Boswell and Double 1934). Members of the Geologists' Association visited the region under the guidance of Professor Boswell during the Easter excursion, 1935, and in connexion with that visit a general account of the geology of the region was published, followed by a report of the Field Meeting (Boswell 1935 a, b ). My active interest in the area was awakened on reading these last two papers and studying some of the excellent photographs by which they are illustrated. They recalled other occurrences of apparently similar structures in this country and in North America. Professor Boswell states (1932, p. 31) that the Denbighshire structures were due to “obviously post-Caledonian” movements, whereas the structures which I had seen in other areas seemed to me to be demonstrably contemporaneous with the deposition of the rocks among which they occur. A further examination of the problems presented seemed therefore desirable. During a brief visit to the area in August 1935, I saw what I considered to be conclusive evidence that the structures near Llangerniew were contemporaneous with the deposition of the Lower Ludlow rocks which exhibit them,

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