1873.] BEYCE — JURASSIC EOCKS OE SKYE AND EAASAT. 325 



away with them an undercliff of the overlying trap, which, with 

 castellated rocks and spiry pinnacles, almost rivals the Storr in pic- 

 turesque grandeur. The disappearance of the beds here and at 

 Portree harbour is not to be ascribed to the clip, but to their being 

 cut off by the trap which also overlies them ; this has been remarked 

 by Dr. Macculloch. 



Our next sections are taken from the area of the greatest develop- 

 ment of these beds, that, namely, which extends from the north side 

 of Portree harbour to the waterfall opposite Holm Islet. 



Section IY. 



Depressed below the sea-level all round Portree harbour, the beds 

 rise again at Scoribrae at the north-east extremity of the bay, as 

 shown in the sketch (PI. XI. fig. 7), and, after a short course 

 in this direction, are again cut off through a considerable space by 

 the descent of the trap rock to the sea-level ; rising again and thick- 

 ening rapidly, they attain their greatest development nearly under 

 the Tor-vaig mountain, which is 1280 feet in height. The beds 

 represented in the figure belong to the Inferior Oolite, and are finely 

 exhibited in this Scoribrae section. The following is the succession 

 of the beds in descending order : — 



1. Basalt. ft. in. 



2. White gritty sandstone, the wall of an amphitheatre, for about... 80 



3. Shelly limestones, fissile above and thick-bedded below ; fossils, 



Cidaris, sp. ? Biastopora dhluviana, &c 43 6 



4. Argillaceous sand-rock, with large spherical limestone nodules ; 



surface irregular ; fossils numerous, among them are Ammo- 

 nites Humphriesianus, A. Strangwaysi, A. Murchisonce, Belem- 

 nites giganteus, B. insculptus, B. gingensis, B. Blainvillei, 

 Pecten lens, Cidaris Fowler i 120 ? 



5. Sandy shales and fissile limestone 1 , , .„ „ 



6. Marine arenaceous limestone j about 4U U 



7. Soft sandstones and fissile sandstones ; A. Murchisonce. . . 



8. Calciferous sandstone, with calcareous bombs ; A. Mur- \ about 100 



chisonm 



Sea-level 383 6? 



The resemblance is manifest between these beds and C, B, and A, of Sect. II. 

 The development is greater, and the fossils more numerous and remarkable. 



Section V. 



A little to the north of the highest point of the mountain, nearly 

 over Prince Charles's Cave, as a small excavation in the Middle 

 Lias is called, the following section was obtained : order descending. 



Lias and Oolites. 



ft. 



1 . Basaltic covering. 



2. Black Estkcria-shates. 



3. Basaltic sheet, interposed, rudely columnar 35 



4. Blue flaggy subcrystalline limestone, weathering white, made up of 



shell-fragments lying in a crystalline paste, and containing Meri- 

 tina sfajp'nensis, small Cyrence, Cyprides, and seeds of Chara. 



5. Thin beds of black shale. 



