ON THE COAL-FORMATION AT DURHAM 



eft 



a 



o 



ft 



22 



23 

 24 



25 



26 



27 



28 



29 



30 

 31 



32 

 33 

 34 

 35 

 SO 

 37 

 38 

 30 



40 



NAMES. 



COLLIERS, 



WERNERIAN, 



Post, mixed with 

 coal, 



A limestone coal, 



Thill, 



Grey metal, 

 Ironstone, 



Grey metal, with 

 ironstone galls, 



Coal, 



Blue metal, 

 Coal, 



Blue metal, 

 Ironstone, 

 Blue metal, 



Sandstone, containing 

 carbonized casts of 

 vegetables, 



Bituminous shale, 



Slate-clay, 



Friable Sandstone, 



Clay-ironstone, 



Friable sandstone, con* 

 taining galls of iron- 

 stone, 



Slate-coal, 



Slate-clay, containing 



ironstone galls, 

 Slate-coal, 

 Slate-cJay, 

 Clay- ironstone, 

 Slate-clay, 



} 



} 



} 



n . g .V • .. r Sandstone,having a slaty 



>G.rdles, (post), J structui : e> S r ; 



Main coal, 



Thill, 



Splint coal. 

 Thill, &.c, 



r Slate-coal, having a con- . 

 J siderable portion of 

 pitch-coal intermixed, 

 Bituminous shale, 

 C Slate-coal, earthy mat- * 

 \ ter intermixed, 



J 



Thickness. 



Fath. 



o 

 o 

 o 

 I 

 o 



o 

 I 

 o 



Q 

 O 

 I 



o 



o 



40 



Ft. 



3 



o 



o 

 o 

 o 



o 



o 



o 

 a 

 o 

 o 



o 

 o 



Main Dip, about i£ in 9 towards E. 

 Side Dip, about # in 9 towards S. 



