488 ON THE 



COAL- FORM ATI ON 









I as. 



r t. 



in. 



Various strata. 



22 



O 



0 



G. A coal, 



o 



Q 



O 



Various strata. 



66 



0 



O 



H. A coal, 



o 





O 



Various strata. 



IO 



O 



O 



I. A coal, 



o 





6 



Various strata. 



I© 



O 



0 



K. A coal, 



o 



3 



6 



Various strata, 



28 



0 



0 



TAT ~" 



L. A coal, 



- o 



4 



6 





238 



0 



0 



Coals *, ' 



0 



46 





The measures are reckoned from the pavement 

 of one coal to the pavement of the next ; and the 

 distances are nearly the average, taken at different 

 places of the field. 



* There are other thin seams, which at present are 

 reckoned unworkable, being under thirty inches thick ; 

 but this is an indefinite term, as the thickness of coals 

 reckoned workable, is regulated in precise proportion to 

 the scarcity of fuel in that district of country where coal 

 is wrought. For example, under peculiar circumstances, 

 we have seen a coal wrought of only six inches thick. 

 The seams of coal in Clackmananshire being numerous, 

 and many of these above three feet thick, the lesser 

 seams are at present of no value, and quite disregarded. 

 When the individual strata arc treated of, theic seams 

 will be taken notice of. 



