/ 



49^ OK THE COAL-FORMATION 



No accurate borings have been made below the 

 last coal K. 



At ab©ut 426 yards southward from the crop 

 of this coal, a reverse dip of the strata takes place ; 

 but the angle it makes with the horizon has not 

 been ascertained. This reverse, or south dip con- 

 tinues across the river Forth, and we find that the 

 strata at the Dunmore Colliery, on the other side 

 of the river, correspond with this new inclination. 

 The bearing of this new dip crosses the line of 

 section in an oblique direction, but as there is no 

 visible alteration to be observed at the surface of 

 the ground, we have not yet been able to deter- 

 mine, whether this alteration in the dip is produ- 

 ced by a slip or dike, or simply by the inflection 

 of the strata, termed by miners a Saddle. 



We now return to the north point, at the De- 

 von Iron- works, where we began the general de- 

 scription of the strata. There, we have every 

 reason to suppose, that the coals before mentioned 

 continue to dip northward, because we see evident- 

 ly, that the crops of the strata cross the Devon 

 river towards the hills, with a bold sweep both to 

 the west and east of the line of section. 



The cover of earth being deep at the bottom 

 of the Woodhill face, and no operations having 

 been carried on in coal-mining there, we cannot 

 exactly state how the coal-strata dip at that pre- 

 cise spot ; but wc have every reason to conclude, 

 that they are laid upon the hill face at an angle of 



