382 ARRAN. GEOLOGY. SECONDARY STRATA. 



being followed downwards, as might from previous obser- 

 vations be expected, by the schist and the granite. It 

 may also be observed occupying the sides of Glen Shira, 

 and extending along the Brodick road to a distance indi- 

 cated in the map, so as to form the mass of a nameless 

 hill ; its position being erect, irregular, and apparently 

 much disturbed. Here, and to the southward of this 

 place, it becomes connected with a new series of rocks, 

 the trap, syenite, and porphyry, which will be described 

 hereafter. At the back of Brodick wood a bed of lime- 

 stone is found to alternate with it, and shale is also seen 

 in different places, similarly alternating, but never in a 

 very conspicuous or extensive manner. There also, the 

 conglomerate is to be observed mixed with the fine sand- 

 stone in the irregular manner which might from previous 

 description be expected. 



To prevent unnecessary repetitions respecting that 

 which can have no further interest in a scientific view, 

 and is of no moment even in a topographical one, I 

 shall here premise, that although fhe secondary strata 

 found in the other parts of Arran still undescribed, 

 consist chiefly of the common red sandstone, yet that 

 the conglomerate, the shales, the white sandstone, and 

 the limestone, are occasionally found with it ; never 

 abundantly, and scarcely ever attended with circum- 

 stances which render it necessary to note the places 

 where these variations or subordinate substances occur. 

 In a general view, the whole mass may be considered 

 as consisting of red sandstone ; where conspicuous 

 changes are found they will be noted in their proper 

 places. I must here however mention, that fragments 

 of limestone have been found between Brodick and 

 Shiskin, and in other parts of the island, which have 

 been described as transition limestones. The specimens 

 in question are all derived from beds occurring in the 

 red sandstone in these different places; nor is there 



