16 



Mr. N. J. Winch on the Geology of 



texture, and it seems to be intermediate between common and 

 cannel coal. 



These varieties are not found to occupy separate and peculiar 

 seams of the coal formation, but alternate irregularly with one 

 another, as layers of the same bed. 



At Wylam they are met with in the following order. 



At 6 fathoms . . , 



21 



32 



High main 



Five quarter 



Six quarter 



Yard coal 



Horsley Wood seam . 



Fine splint 

 Stone band 

 Clean coal 

 Coarse coal 



Splint .... 

 Clean coal , 



Clean coal 



Splint 



Coarse coal 



Slaty band 

 Free coal . 

 Coarse coal 



Clean coal , 

 Splint 



Feet 



Feet 

 5 



Splint coal is also found at Throckley, Kenton, and some of the 

 Lambton collieries situated on the Wear. Coarse coal occurs at 

 Cockfield and many other places. These two varieties, containing 

 little bitumen and less sulphur, are used in iron founderies, pot- 

 teries, &c. ; and splint serves as a material for building cottages 

 and outhouses in the neighbourhood of Throckley Fell. 



Potters' clay is found immediately below the vegetable soil. Its 

 colour is blueish or smoke grey, and sometimes yellow approaching 

 to orange, in consequence of a mixture of iron ochre. It is used in 

 t h * manufacture of coarse earthenware, bricks, and tiles. 



