Hostname: page-component-78c5997874-g7gxr Total loading time: 0 Render date: 2024-11-20T01:02:39.644Z Has data issue: false hasContentIssue false

Note on the Determination of the Limit between the Silurian and Devonian Systems

Published online by Cambridge University Press:  01 May 2009

Extract

IN a recently published paper on the “Highest Silurian Rocks of the Clun Forest District, Shropshire” the present writer gave an account of an area where the series of “passage-beds”, marking a gradual transition from Silurian to Old Red Sandstone conditions, is well seen. The succession there is practically identical with that established by Miss Elles and Miss Slater in the Ludlow District. From November, 1918, to October, 1919, whilst engaged in a study of Belgian Tertiary rocks, I have had an opportunity of visiting some of the more important sections of the Gedinnian in the Ardennes and also of examining the palæontological collections at Brussels, Lille, and elsewhere. This work has thrown very considerable light on the English succession, and it seems desirable to give here a resumé of the conclusions reached.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 1920

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

page 164 note 1 Quart. Journ. Geol. Soc., vol. lxxiv, 1918, p. 221, 1919.Google Scholar

page 164 note 2 Ibid., vol. lxii, 1906, p. 195.

page 165 note 1 Mém. Musée royal d'Hist. nat. de Belgique, vol. vi, 1912.Google Scholar

page 165 note 2 Mém. Soc. géol. du Nord, vol. v, 1906, pp. 2639.Google Scholar

page 165 note 3 Loc. cit., p. 231.Google Scholar

page 166 note 1 Gosselet, , Barrois, , Leriche, , & Crépin, , “Description de la Faune siluro-dévonienne de Liévin”: Mém. Soc. géol. du Nord, vol. vi (ii), 1912Google Scholar. Leriche, , Mém. Soc. g´ol. du Nord, vol. v, 1906.Google Scholar

page 166 note 2 C.R. des Séances de l'Acad. des Sci. (Inst. de France), vol. 167, 1918, p. 705.Google Scholar

page 167 note 1 Stamp, , loc. cit., pp. 228–9.Google Scholar

page 167 note 2 Elles, & Slater, , Quart. Journ. Geol. Soc., vol. lxii, 1906, p. 195; Stamp,CrossRefGoogle Scholar ibid., vol. lxxiv, 1918, p. 221, 1919.

page 168 note 1 Throughout this note the term “Downtonian” is used in its restricted sense, applying only to beds above the horizon of the Ludlow Bone-bed.Google Scholar

page 168 note 2 See Evans, , Geol. Mag., Vol. LVI, 1919, p. 549.Google Scholar

page 168 note 3 Leriche, , “Poissons fossiles du Nord de la France”: Mém. Soc. géol. du Nord, vol. v, 1906, pp. 1321.Google Scholar

page 168 note 4 Compare South Devon, and Cornwall, , Green, and Sherborn, , Geol. Mag., 1913, p. 70.Google Scholar

page 170 note 1 Silurian Rocks, Scotland (Mem. Geol. Surv.), 1899, pp. 68–9, p. 568 et seq.Google Scholar

page 170 note 2 Campbell, , “The Geology of South-Eastern Kincardineshire”: Trans. Roy. Soc. Edin., vol. xlviii, 1913, p. 923.CrossRefGoogle Scholar

page 171 note 1 Mém. de l'Inst. géol. de l'Univ. de Louvain, vol. i, 1913.Google Scholar

page 171 note 2 Siluria, 4th ed., 1867, pp. 134–5.Google Scholar

page 171 note 3 See De Dorlodot, , Bull. Soc. belge Géol., vol. xxvi, 1912, Proc. verb. pp. 1739, 62–5Google Scholar; Ann. Soc. géol. Belgique, vol. xxxix, 1912, pp. m 291–m 371.Google Scholar Mailleux, , “Le texte explicatif du lévé géol. de la plan. de Couvin,” 1912 (Serv. géol. Belgique): Bull. Soc. belge Géol., vol. xxvi, 1912, Proc. verb. p. 139Google Scholar. Fourmarier, , Ann. Soc. géol. Belgique, vol. xxxix, 1912, p. 233Google Scholar. Leriche, , Bull. Soc. belge G´ol., vol. xxv, 1911, Proc. verb. p. 327.Google Scholar

page 171 note 4 Indicated by King, & Lewis, , Proc. Birmingham Nat. Hist. and Phil. Soc., vol. xiv, 1917, p. 90.Google Scholar