254 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



excellent sections for geological study. Faults are seen to traverse 

 the rocky platform in all directions, and varying in throw from a 

 fraction of an inch to hundreds of feet. Fine examples of current 

 bedding are to be seen both on the shore and the cliff section. 

 The rocky platform is also intersected by very numerous dykes 

 and by sills of igneous rocks, as many as sixty dykes having been 

 counted between Brodick and Clauchland Point. Many travelled 

 boulders strew the beach, more especially boulders of granite, 

 which have evidently been borne by the agency of ice from the 

 area of the intrusive granite of the interior of the island. One 

 of these, near Corriegills, is of enormous size, and its weight has 

 been estimated at over two hundred tons. The bay at Corriegills 

 is crowded with these boulders, and this would appear to be the 

 spot where the ice which bore them from their home in the 

 neighbourhood of Goatfell, had finally melted and left them 

 stranded. Further on, upon the shore beneath Dun Fionn, and 

 associated with a sill of felsite, occurs a vein of pitchstone 

 exhibiting a beautiful spherulitic structure. The red sandstone 

 on the shore here weathers very prettily into honeycomb-like 

 forms, slabs of which are often used for decorative purposes in 

 the gardens of neighbouring cottages, nature's handiwork thus 

 being recognised in preference to artful ornament. On a higher 

 horizon on the north face of Dun Fionn there occurs a large sill 

 of pitchstone — the so-called " bottle rock " of the natives — which 

 has been intruded among the sedimentary rocks. The ridge of 

 the Clauchland Hills, here some 600 ft. above the shore, is 

 capped by a sill of dolerite showing rude columnar structure, and 

 the beach below is strewn with huge masses of the columns which 

 have fallen from the cliffs above. The dolerite runs out to sea 

 near Clauchland Point, and its junction with the sandstone is well 

 shown on the beach. The sandstone has been much indurated at 

 the point of contact, and changed into a quartzite. An easy 

 ascent westward along the ridge of the Clauchland Hills brought 

 the party to Dun Fionn. from which was obtained a most imposing 

 view, extending from the mountains of the Western Highlands 

 to the southern extremity of the Ayrshire coast. 



Mr. D. A. Boyd spent some time in exploring the woods and 

 cliffs along the shore between Invercloy and Corriegills, where he 

 noted thirty-six species of Microfungi. Amongst these were 



