COAL-FIELD OF CLACKMANNANSHIRE. 153 



It may be convenient to the reader to have the 

 Sections represented in Plates IV. V. VI. VII. 

 and VIII., here explained in one connected view. 



Plate IV. 



Fig. 1. is a profile of Clackmannanshire from the 

 summit of the Woodhill of Alva, one of the 

 Ochill Mountains, southward to the River 

 Forth, the line being nearly at right angles to 

 the general bearing of the strata, comprehend- 

 ing a space of six miles and sixty-three yards. 

 It also contains a section of the beds of coal, 

 and great slips or dislocations of the strata, in 

 so far as they have been ascertained. This sec- 

 tion comprehends the main coal-field of Clack- 

 mannanshire. 



Fig. 2. is a horizontal section of the Clackmannan- 

 shire coal-fields, shewing their junction with the 

 Ochill Mountains, the direction of the great 

 slips or dislocations, and the form of the coal- 

 fields, 



Fig 3. is the Blairngone coal-field, of an entire 

 bason-shape. 



Fig. 6. is a plan shewing the effect produced upon 

 a coal-field of a bason-shape, by two slips or 

 dislocations of the strata. 



