168 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [June 17, 



formation referred to is well exposed, resting unconformably on these 

 older beds at a low angle. The first bed seen in the cliffs is a coarse 

 conglomerate or breccia, composed of slightly rounded fragments. 

 Some of these were evidently derived from the older red sandstone 

 below. I had no hesitation in identifying others with the quartzite of 

 the neighbouring mountains, though often of a softer texture, and 

 more like a white sandstone than the hard vitreous rocks of Ullapool 

 and Assynt. More interesting were the fragments of limestone, 

 often of a blue colour and compact, at others reddish white and more 

 crystalline, which made up a large portion of some beds. These 

 again I regarded as derived from the limestone that overlies the 

 quartzite series ; and as the fragments were from two to four inches 

 in diameter, and had apparently undergone less alteration than the 

 rock where still seen in situ, I had hopes that they might contain 

 some recognizable petrifactions. With this view I examined a large 

 number, but did not succeed in finding any trace of organization . 



Above this conglomerate or breccia, are strata of a soft friable 

 sandstone, forming the larger part of the deposit. It is generally of 

 a red colour, in other places reddish white, or again red mottled with 

 green and blue. In some parts it contains much calcareous matter, 

 effervescing strongly with acids, and appears to be easily acted on by 

 the sea and atmosphere, the surface having that carious and cor- 

 roded aspect so common among red sandstones. 



These newer beds dip at about 10° to N.W. (true) ; and, as shown 

 in the subjoined sections, have been deposited amid the broken ends 

 of the older sandstones. The newer rock forms a natural archway 

 (see fig.), supported on walls of the older rock, and partly converted 

 by the fishermen on the coast into a rude hut to shelter themselves 

 and their implements from the weather. As shown in the figure, 

 the shore is here covered with huge boulders of the older red sand- 

 stones, of granite, and the green-coloured gneiss, or hornblende rock 

 common in the mountains in the interior. 



This newer sandstone is of very limited dimensions, being soon 

 cut off towards the west by lofty cliffs of the older red sandstone 

 forming the high land towards the extremity of the peninsula. It 

 also does not extend far into the interior, where the older rock is soon 



