On the Coal-field of Sutherland, 



55 



Fi^. 7. 



Stnu containing coal 



Oranlte. 



Greneral notion of the nature of the Sutherland Coal-field. 



EXPLANATION OF THE CUTS. 



Fig. 1. This represents the general view of the whole line of the junc- 

 tion, reduced to an imaginary section by the omission of all the pictu- 

 resque irregularities. The extent is also condensed. The apparent 

 stratification of the upper surface of the granite is represented near the 

 cave, where it is accessible to the hand. 



Fig. 2. Is an enlarged drawing of the interesting part near the cave, 

 where the apparent stratification of the granite is more distinctly re- 

 presented. 



Fig. 3. Represents other portions of the surface of the granite. The 

 sandstone strata have disappeared here for a certain space, so as to leave 

 the granite forming a step or shoulder ; and on it are seen portions of 

 the same apparently stratified granite as that which occurs near the 

 cave. 



Fig. 4. Represents a point where the depressions or irregularities in 

 the surface of the granite are attended by corresponding inequalities in 

 the incumbent sandstone. 



Fig. 5. Sketch of a view on the coast, pointing out the commence- 

 ment of the conglomerate. 



Fig. 6. General notion of the mode in which the granite separates the 

 sandstone of Caithness from the coal-field of Sutherland. 



Fig. 7. A general imaginary section of the coal-field, founded on the 

 succession of strata observed in different parts of it. The true position 

 of the granite to it could not be represented, even in many sections, 

 from the peculiar mode in which the strata are related to that rock ; but 

 the present mode of delineating it serves to shew that it is in contact with 

 all the members. 



