﻿Yol. 66.] SCHISTS OF THE SCOTTISH HIGHLANDS. 617 



It will be seen that this evidence, so far as it goes, strengthens 

 the view that the Leven Schists here underlie the Eilde Flags. If 

 the limestone mentioned above belonged to the Ballachulish Core, 

 one would expect it to lie between the thick development of Leven 

 Schists with which it is associated and the Eilde Flags, whereas 

 the reverse is the case. On these grounds it is suggested that 

 the limestone outcrop of Loch Dochard belongs to the Appin 

 Core, although separated from the gape of the latter in Glen Duror 

 "by a distance of 17 miles. 



IV. Conclusions. 



1. The schists of the Highlands of Scotland are disposed in a 

 succession of recumbent folds of enormous amplitude. 



2. The limbs of these folds are frequently replaced by fold-faults, 

 or slides, which have given freedom of development to the folds 

 themselves. 



3. The sliding is not confined to the lower limbs of recumbent 

 anticlines, and is therefore due to something more than mere over- 

 thrusting. It is a complex accommodation phenomenon, of a type 

 peculiar perhaps to the interior portions of folded mountain-chains. 

 In fact, the cores of many of the recumbent folds have been 

 squeezed forward so that they have virtually reacted as intrusive 

 masses. 



4. In the growth of these structures many of the earlier-formed 

 •cores and slides have suffered extensive secondary corrugation of 

 isoclinal type. 



V. Bibliography. 



[1] J. Nicol. ' The Structure of the North- Western Highlands.. & the Relations 

 of the Gneiss, Red Sandstone, & Quartzite of Sutherland & Ross-shire ' 

 Quart. Journ. Geol. Soc. vol. xvii (1861) p. 85. 



[2] C. Callaway. ' The Age of the Newer Gneissic Rooks of the Northern High- 

 lands ' Quart. Journ. Geol. Soc. vol. xxxix (1883) fig. 7, p. 391. 



[3] C. Lapworth. 'The Secret of the Highlands' Geol. Mag. 1883, p. 120; also 

 ' The Close of the Highland Controversy ' Ibid. 1885, p. 97. 



[4] F. L. Cornet & A. Briart. ' Sur le Relief du Sol en Belgique apres les 

 Temps Paleozoiques ' Annales Soc. Geol. Belgique, vol. iv (1877) p. 71; and 

 J. Gosselet, ' Sur la Structure generale du Bassin Houiller franco-beige,' 

 Bull. Soc. Geol. France, ser. 3, vol. viii (1879-1880) p. 505. 



[5] B. N. Peach & J. Horne. ' Report on the Geology of the North- West of 

 Sutherland' Nature, vol. xxxi (1884) p. 31. And with Survey Colleagues. 

 ' Report on the Recent Work of the Geological Survey in the North-West 

 Highlands of Scotland ' Quart. Journ. Geol. Soc. vol. xliv (1888) p. 378 ; also 

 ' The Geological Structure of the North- West Highlands of Scotland' Mem. 

 Geol. Surv. 1907. 



[6] G. Barrow. ' On the Occurrence of Silurian (?) Rocks in Forfarshire & 

 Kincardineshire along the Eastern Border of the Highlands ' Quart. Journ. 

 Geol. Soc. vol. lvii (1901) p. 328. 



[7] A. E. ToRNEBOmi. ' Om Dalformationens geologiska Alder ' Geol. Foren. 

 Stockholm Forhandl. vol. vi (1883) p. 622' ; ' Om Fjallproblemet ' Ibid. 

 vol. x (1888) p. 328; ' Grunddragen af dot Ccntrala Skandinaviens Berg- 

 byggnad' Kongl. Svenska Vet.-Akad. Handl. vol. xxviii, No. 5 (1896), with 

 German summary. 

 ' T8] A. G. Hogbom. Geologisk Beskrifning ofver Jemtlands Lan ' Sver. Geol. 

 Undersokn. Afhandl. ser. C, No. 140 (1894). 



• 9] W. Kilian & J. Revil. ' Notice sur la Vie & les Travaux de Marcel Bertrand ' 

 Grenoble, 1908. 



