154 COAL-FIELD OF CLACKMANNANSHIRE. 



Plate V. 



Nos. 1, 2, 3, 4, 5. are vertical sections of coal-fields. 

 No. 1. corresponds with the ordinary arrange- 

 ment of coals in the coal-fields of Great Britain. 

 Nos. 3, 4, and 5. are sections of coal-fields, 

 which differ much from No. T. 



Fig. 6. Section of the great coal-field of the Lo- 

 thians. 



Plate VI. 



Fig. 1. Section of the Castlehill, Dudley, Stafford- 

 shire. 



Fig. 2. Section of Wren's-nest Hill, Dudley, Staf- 

 fordshire. 



Fig. 3. Stratum of sandstone, with portions of it of 

 uncommon hardness. 



Plate VII. 

 Fig. 1. Section of the Quarrel ton coal, in the coun- 

 ty of Renfrew, shewing the overlapped coal 

 and the double coal, with the thick bed of green- 

 stone overlying the coal-field. 



a, Alluvial cover. 

 &, Bed of greenstone. 



c, Alternating coal strata. 



d, Coals. 



e, Position of greenstone not ascertained. 



