1873.] JJRYCE — JURASSIC ROCKS OF SKYE AND RAASAY. 327 



ft. 



11. Argillaceous sands with hard courses. 



12. Massive yellow and white sandstone with carbonaceous stains ... 10 

 lo. Shaly sandrock, with hard calciferous sandstone courses, and 



fossiliferous nodules towards top: A. Murchisonce, Bel. gin- 

 c/ensis, Pecten Bewcdauei, Inoceramus, Ciccullcea cancellala, 

 Cypricardia. 



14. Shaly sandrock, greyish and bluish yellow : Belemnites confertus. 



15. Micaceous argillaceous sandrock, with hard lenticular masses 



above : A. Murchisoncs, Bel. ventralis, Lucina Wrightii. 



16. Ljyninated sandy micaceous shales, with Belemnites. 



17. Upper Lias 50 



18. Middle Lias. 



This section has a striking analogy with Section V. The two compared 

 with Section IV. may be thus generalized : — 



Generalized Section. Beds in detailed Sections. 



P. C. Cave. Scoribrae. 



Infra-Oxfordian Estuarine beds 3 and 1 wanting. 



Bath Oolite series, ? Estuarine 4 2 



Inferior Oolite. 



Upper series, Limestones 6-7 3 



Middle series, Sandstones 8-12 4-8 



Lower series, Shales and Sandstones 13-16 wanting. 



On the western declivities of the basaltic cliffs which fall away 

 towards the two lakes already mentioned, the upper beds of the 

 Middle Oolite make their appearance, owing to the denudation of 

 the overlying trap. The fossiliferous beds are shewn in a steep brow, 

 facing northwards and south-east, of the south-east termination of 

 Loch Fada, and also in the bed and banks of two or three burns 

 which descend from the back of the precipices towards the central 

 depression dividing them from the basaltic cliffs of the Storr range. 

 The ridges of higher ground dividing the burns are formed of the 

 common trap-rock. The fossiliferous beds consist, in ascending 

 order, of reddish sands, fuller's-earth, sandy marls full of several 

 species of Cyrenai, and soft sandstones, over which is the trap. 

 The deepest section, in the brow just mentioned, is about 20 

 feet ; the others are only 2 or 3 feet ; and sometimes it is merely 

 an edge which emerges, or slabs appear in the bottom of a stream. 

 Other fossils occurring here are Neritina staffinensis and Melania ? 

 inermis. At a still lower level, by the shores of the lakes, the 

 marly beds with Cyrena Brycei and the oyster-bed of Loch Staffin, 

 with Ostrea Tiebridica, make their appearance, and seem to form 

 the basin of the lakes and much of tbe level tracts around them ; 

 calcareo-micaceous sandstone forms large rock-masses, pierced by a 

 natural arch. At the north end of Loch Leathan it occupies the 

 floor of the margin on two sides, and extends thence down the valley 

 to the upper and lower cascades upon the stream forming the out- 

 let. Here two of the basaltic sheets which enter the foregoing sec- 

 tion (No. V.) are seen interposed among the Oolitic strata; and it is 

 to their existence here that the cascades are due, as they have not 

 been worn away. From their surface the water takes its headlong 

 leap, and has excavated the soft strata below, in the case of the 



