The Geology of the Tintagel and Davidstow District (Northern Cornwall)

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Abstract
Introduction. Since the publication in 1839 of the far-famed Memoir by Sir Henry de la Beche on the ‘Geology of Cornwall, Devon & West Somerset,’ a large part of the first-named county has been left comparatively unmolested, alike by the hammer and by the theories of the geologist. Thus the district which lies to the west-ward of the fossiliferous Upper Devonian Beds of South Petherwin and Landlake, from St. Clether, in a westerly direction, via Davidstow and the North Cornwall branch of the London & South-Western Railway to the coast, has been almost untouched, except for four papers, since the date above mentioned. My sincere thanks are due to Prof. T. G. Bonney, F.R.S., for kind suggestions in the course of the preparation of this paper; to Lieut.-Gen. C. A. MacMahon, F.R.S., for the loan of slides of the Cock's Tor rock; to Miss Raisin, D.Sc., for specimens and slides from the Ardennes; to Mr. G. T. Prior and Dr. J. S. Flett, for invaluable aid in determining some of the minerals; and to Mr. E. T. Newton, F.R.S., for kind help with the fossils. These are, from the coast east of Tintagel Head (between Barras Gug and Smiths Cliff) forms comparable with Atrypa flabellata and with Posidonomya ; and Spirifera Verneuilii from Lanterdan Quarry. A list of fossils from Tintagel was given by Holl. In regard to the general structure of the country, two points are of great importance. First, ly, from St. Clether on the east to the Rocky

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