ARRAN. GEOLOGY. SECONDARY STRATA. 383 



the slightest evidence of any other class of rocks than 

 those already mentioned in the general sketch of the 

 island. 



It is perhaps already understood, that the angle of 

 the dip of these remaining portions is generally so low 

 that no access is any longer to be obtained to the 

 lowermost" beds. This is the case on the sea shores, 

 where the most continuous and accessible masses are 

 to be seen. But it is necessary also to remark, that, 

 from the superincumbence of trap, the portions of 

 sandstone found in the hills neither present any con- 

 tinuous extent, nor, as in the elevated portions of the 

 northern tract, expose their broken edges so as to give 

 access to their alternations or lower beds. 



As the sandstone is found in the lower part of 

 Glen Shira, so it extends up Glen Cloy, and across the 

 land towards Lamlash bay; in which situation however 

 it is so often covered by the rocks already mentioned, 

 that a continuous tract is never to be seen. It is most 

 continuous and best exposed to observation on the 

 shore between Brodick and Lamlash bays ; where it 

 is covered by beds of trap, and intersected, not only 

 by trap veins, but by veins of porphyry, claystone, and 

 pitchstone. It is unnecessary to dwell on the portions 

 which continue to be visible at Kilbride, round the 

 skirts of the bay and within the land ; but I may 

 remark, that the most extensively continuous tract 

 perhaps throughout the island, is that which occupies 

 the segment cut off by an irregular line drawn between 

 Kijbride and Kildonan, including Whiting bay. Even 

 in this extensive mass, trap as well as porphyry is 

 occasionally found, showing that either veins or over- 

 lying masses exist throughout it. 



The state of the sandstone in the remainder of the 

 southern division is such, that nothing but the most 

 general description of it can be given. Occasionally, 

 it is to be seen over the whole tract, wherever the 



