COAL-FIELD OF CLACKMANNANSHIRE. 155 



f, Strata in which no coals have been found. 



g, The overlapped coal. 

 h 9 The double coal. 



Plate VIII. 



Fig. 1. is the horizontal section of a coal-country, 

 shewing the effects produced by dikes, slips and 

 dislocations of the strata, by which coal-fields 

 are extended over a great district of country, 

 which prevent the coal running out (as it is 

 termed), or dipping to an unfathomable depth. 



Edinburgh, 1st May 1819. 



