45^ ON THE CONGLOMERATE-ROCK 



At the promontory which forms the western 

 headland of the Bay of Stonehaven, this conglo- 

 merate rests upon a dark-brownish-red sandstone, 

 thinly stratified, its layers seldom exceeding a foot 

 or a foot and a half in thickness. This sandstone 

 has a considerable degree of induration, and is 

 here wrought for the various purposes of ma- 

 sonry. r 



In its position, it is nearly vertical, and the'thick- 

 ness of the whole of its stratification is about half a 

 mile. In this sandstone, within a few yards of 

 where the conglomerate rest upon it, a bed of 

 greenstone occurs, of about 40 feet thick. It is 

 nearly vertical in its position, and stands between 

 two of the layers of the sandstone, both of which 

 are in contact with it. 



Upon the eastern side of the bay of Stonehaven, 

 this red sandstone rests upon a clay-porphyry, the 

 principal mass or base of which consists of an in- 

 durated clay, the fresh fracture of which is of a 

 purple or lilac-brown colour. Its induration is 

 considerable, but its fracture is rough and earthy. 

 Its imbedded materials are, small particles of tran- 

 sparent quartz, small felspar masses, which some- 

 times are in crystallised forms, scales of blackish- 

 brown mica, and specks of iron-ochre ; but all 

 these are rather thinly scattered in the mass. 



At the Burn, about 17 miles to the north-west 

 of Stonehaven, where the river Northesk issues 



