On the Basalts and Andesites of Devonshire, known as ‘Felspathic Traps’

Abstract

I. Previous Literature. 1797. W. G. Maton. Observations relative chiefly to the Natural History, Picturesque Scenery, and Antiquities of the Western Counties of England. Salisbury, vol. i. pp. 95-97 (describes the Thorverton stone). 1811. J.F. Berger. Observations on the Physical Structure of Devonshire and Cornwall. Trans. Geol. Soc. vol. i. pp. 100-102 (describes the amygdaloid of Poucham [probably Pocombe], Upton Pyne, 1 and Thorverton). 1821. Rev. J. J. Conybeare. On the Geology of the neighbourhood of Okehampton, Devon (" memoranda on the Red Marle" at end); Annals of Philosophy, new series, vol. ii. pp. 165, 166 (describes the amygdaloid of Thorverton, Silverton, and Radden [Raddon Court] quarries). 1835. Sir H. T. De la Beche. " Note on the Trappean Rocks associated with the (New)Red Sandstone of Devonshire," Prec. Geol. Soc. vol. ii. (1833-8) pp. 196-8 (mentions the trappean rocks "near Tiverton, Thorverton, Silverton, Kellerton Park, Crediton, and Exeter," and gives the geological history of those at Washfield, near Tiverton. 1839. Sir H. T. De la Beche. Report on the Geology of Cornwall, Devon, and West Somerset (Geol. Survey Memoir)pp. 199-204, 211, 212, 215, 216, 489. 1839 ? (no date). One-inch Geological Survey Maps, Sheets 21, 22, 24, 26 (almost all the important exposures are included in Sheets 21 and 22). 1865. W. Vicary, F.G.S. On the Feldspathic Traps of Devonshire. Trans. Devon. Assoc. vol. i. pt. iv. pp. 43--49 (gives additional localities and fuller details of the macroscopical characters of the rocks). 1890. R. N. Worth, F.G.S. The Igneous Constituents