Mr. DvNN on the Edge Seams of Mid-Lothian. 165 



No. XVIII. — Notice of the Edge Seams of Mid-Lothian, <with a Descrip- 

 tion of Gilmerton Colliery, notv taorking the lowest of the Series, called 

 the North Green Seam. By Mr. Matthias Dunn, Colliery Viewer. 



Read, August 16, 1830. 



Phe suite of Edge Seams which traverse this district are seen cropping 

 out on the shore of the Frith of Forth, in the neighbourhood of Porto- 

 bello, the streak, or water-level course bearing about south 20° west, with 

 a north-west rise and south-east dip. 



They were originally won by sea-levels, and subsequently at lower 

 depths by engines, in the several estates of Duddingstone, Brunstane, 

 Niddrie, Edmondstone, Drum, Gilmerton, &c. They comprise about 

 twenty-four workable beds of Coal, and their thickness and distance 

 from each other, in Niddrie Colliery, are as under. 



CLASSIFICATION OF SEAMS IN NIDDRIE COLLIERY. 



North-Easteen Division. 



Fathoms. Thickness, 

 asunder. Ei. In, 



1. Gramachome or Diamond Coal, 5 10 



2. From Ditto to Salter's Coal, 48 4 10 



3. Further to 9-Feet Coal, 81 5 



4. Ditto to 15-Feet Coal, 5 7 



5. Ditto to 4-Feet Coal, 131 3 



6. Dito to 7-Feet Coal, 71 5 4 



Middle Division. 



1. Ditto to South Parrott, 300 2 4 



2. Ditto to Wood Coal, 29 2 7 



3. Ditto to Flake's Coal, 13 3 



4. Ditto to Rumble Coal, 13 2 9 



5. Ditto to Laverock Coal, 1 2 



6. Ditto to Great Seam, 6 6 8 



7. Ditto to Stair-head Ditto, 8 4 2 



8. Ditto to Great Gilhespie, 11 3 10 



Forward.......... 4631 58 



VOL. I. Z 



