Mr. Dunn on the Edge Seams of Mid-Lothian. I67 



SEAMS OF COAL SUNK THROUGH AT EDMONSTONE COLLIERY, 

 WITHIN 1000 YARDS OF THE EDGE COALS. 



Thickness^ 

 Fathoms, Ft. In. Ft. In, 



At 36 Splint Coal, 2 4 6 



,Coal, 2 0>. 



\Band, 1/ 



Further 7 Coal Rough, ^Coal, 10 >- 5 3 



VBand, 1 2^ 



^Coal, 1 2-^ 



Further 7 Beefy Coal, 4 



Ditto... 14 Diamond Coal, 4 2 



Ditto... 5 Jewel Coal, 4 



~69 ■2rTr 



At Sheriff Hall the dip to the south-east is about one in twelve, which 

 gradually lessens, and the stratification, on passing the river Esk takes 

 an opposite rise analogous to the lying of the surface, till it reaches the 

 high ground in the neighbourhood of Fuffett, where part of the upper 

 beds of Coal, are as it were, washed off. The lower ones continue to 

 undulate through the valley of the Tyne, until they either successively 

 crop out or terminate against the secondary stratification which stretches 

 up the country from the southward of Dunbar. 



Underneath the North Green Seam, and at the distance of about 40 

 fathoms ranges a bed of Encrinal or Carboniferous Limestone, about 30 

 feet in thickness. On the northern crop it is wrought extensively in 

 the Gilmerton estate, and at so great a depth below the surface as 30 

 fathoms, which renders it necessary to leave proportionate pillars (ave- 

 raging about one-tenth) for the support of the roof; the works are 

 drained by a steam engine placed upon a perpendicular shaft upwards 

 of 30 fathoms in depth. But to return to the Colliery. 



Gilmerton Colliery is remarkable as the deepest winning that has 

 ever been made upon the Edge Coals, or, I believe, upon any other 

 C oal in Scotland, and the first in which a Rail- way has been introduced 

 for conveying the produce of Edge Coal workings to the pit bottoms. 



The following account of the strata sunk through was furnished by 

 Mr. Marshall, the lessee. 



