1858.] JAM1ESON — PLEISTOCENE, ABERDEENSHIRE. 511 



I have obtained the following account of the most interesting of 

 these bores. One sunk at the Woolman Hill pierced through — 



Feet. 



1 . Vegetable mould 6 



2. Grey or bluish clay 18 



3. Sand and shingle 20 



4. Light blue clay 6 



5. Rough sand and shingle 3 



6. Old Red Sandstone conglomerate .... 115 



7. Alternating strata of compact red sand- 



stone and clay 74 



8. Mica slate 9 



Another, executed by Messrs. Richards and Co., disclosed the 

 following beds : — 



Feet. 



1 . Moss and black earth 18 



2. Gravel and small stones 14 



3. Reddish clay 5 



4. Loose sand and clay 6 



5. Rock, mostly granitic 132 



To the north of Aberdeen the coast is low, with a sandy beach all 

 the way to the River Ythan. 



Between the mouths of the Dee and Don the surface is generally 

 occupied by coarse water-rolled gravel and shingle, which frequently 

 assumes the form of large irregular mounds and hillocks, such as 

 the Broad Hill, the Powder-magazine Hill, and others. This gravel, 

 so far as my observation goes, is found to rest upon fine strata of 

 clay and sand, occasionally exposed in cuttings at the outskirts of 

 the town. For instance, at the Seaton Brickwork, near the River 

 Don, the following section is got : — 



Feet. 



Gravel 3 



Fine clay of a yellowish-brown or bluish-brown 



hue ; contains some thin seams of sand 16 



Sand and gravel ; depth unascertained. 



The bottom of this section is also about the sea-level. No shells 

 appear to have been found here. These brickworks are generally 

 established at a spot where the gravel-covering is thin, in order to 

 avoid the expense of reaching the clay. 



Keeping still close to the sea, we find another excavation for clay 

 about 2\ miles to the north of the River Don, at a place known by 

 the name of the Black Dog. Here the cutting discloses — 



Feet. 



Coarse gravel and shingle, water-rolled 4 



Fine strata of clay and sand, disposed in undu- 

 lating layers ; contain broken shells ........ 11 



Sand ; depth unknown. 



