of clackmanaNshire. 459 



The coal L. is the lowest which has been 

 wrought in the main coal field. The peculiar 

 character of each seam will be afterwards taken 

 notice of. 



Each of these coals continues to rise from the 

 dip southward, till it meets the earthy cover or 

 clay, excepting the seams I. K. L. These three 

 coals are cut off by the Great North Slip. 



The Great North Slip, from the few points where 

 we have had an opportunity of examining it be- 

 low ground, makes an angle with the horizon of 

 60 c ; it forms a fissure in the strata, varying in 

 width from four inches to nearly four feet. This 

 fissure is filled compactly with pieces of sand- 

 stone, slate-clay, and clay ironstone ; in short, with 

 a mixture of all the adjoining strata. The sides 

 of the fissure are commonly pretty smooth, and 

 in some places have a glossy or polished surface. 



Immediately south, and close to the north slip, 

 the Mid Coal Field commences, and the coals dip 

 at an angle of about io°, or nearly 1 in 6. 



To the first coal, 



A. A coal, 

 Various strata, 



B. A coal, 

 Various strata, 



G. A coal, 



Various strata, 



is in depth, 



Yds. Ft. In. 



26 



0 





0 



3 



0 



18 



0 



0 



0 



2 



6 



12 



0 



0 



O 



3 



0 



m 



0 



0 



