1855.] FOX — SAND-WORN GRANITE. 549 



racters ! The older strata, dark reddish-brown masses, with boulders 

 of quartz, sandstone, felspar-porphyry, and claystone-traps ; — the 

 newer deposit, yellowish-grey in colour, and full of rounded fragments 

 of granite, gneiss, mica-slate, and hornblende and serpentine rocks. 

 Evidently the two deposits represent the detritus and destruction of 

 entirely different lands. So diverse is their aspect and imbedded 

 boulders, that we are almost forced to the conclusion that the ma- 

 terials of the red sandstones have been derived, not from the strata 

 on which they rest, and which formed the sea-bed of the period, but 

 from other rocks constituting the shores of that sea and the valleys 

 of the great rivers that flowed into it. 



The highly inclined position of the sandstone may be ascribed in 

 part to the action of the trap-rocks seen both in the section and also 

 further south on the coast. Their extent does not, however, seem 

 sufficient to explain the whole amount of the elevation ; and I am 

 inclined to think, that, in part, at least, it is owing to the inversion 

 and consequent expansion of the metamorphic strata. The same 

 powerful agency compressing the strata is also needed to explain 

 the singular fractures and indentations of the boulders in the con- 

 glomerate. When these effects were produced, the strata now seen 

 on the surface must have been covered up by an enormous thickness 

 of rock (subsequently removed by denudation), and thus subjected to 

 that degree of temperature required to soften such of the boulders as 

 have received an impression from their less fusible neighbours, and 

 to re-cement those that were broken by the pressure. 



6. Notice of some Raised Beaches in Argyllshire. 

 By Commander E. J. Bedford, R.N. 



(Communicated by Sir R. I. Murchison, V.P.G.S.) 



(The publication of this paper is deferred.) 



[Abstract.] 



Two of these raised beaches are in the Lunga Islands, one of them 

 in Lunga Proper, the other in North Fullah. Their present altitude 

 was calculated to be 40 feet 8 inches above high water mark. A 

 third was found in Kerera Island, and has the same height as the 

 former. These were illustrated by highly finished sketches by the 

 author, which also indicated the position of other raised beaches, in 

 Oronsay at 38 feet 6 inches in elevation, in the south-western angle 

 of Jura at 34 feet 8 inches, and at Loch Tarbert, in Jura, at 42 feet 

 1 inch, and 105 feet 5 inches. 



7. On Sand-worn Granite near the Land's-End. 

 By R. W. Fox, Esq. 



(Communicated by Sir R. L Murchison, V.P.G.S.) 

 On a recent visit to the Land's-End, I noticed some striking evidences 



