208 FIELD GEOLOGY. 



guide us, we find that ere long the boundary resumes 

 its old direction. There is something here to be ac- 

 counted for, but drawing a dotted line to represent the 

 uncertain portion, we leave it for the present and await 

 further evidence. A small pit near the extremity of 

 the sand shows the amount of dip there to be 6 only, 

 but it is the same as the others in direction. 



We now proceed to trace the outcrop of any coal- 

 seams that may occur in the area, and, beginning on the 

 W. side, follow one such line for a short distance, when 

 the evidence of its course entirely ceases. But another 

 line of outcrop commences from the north and south 

 portion of the limestone boundary, and (where traceable) 

 runs nearly in the same direction. When drawn, these 

 two lines of coal-crop, in their direction and (where one 

 ends and the other begins) in their distance from the 

 limestone, look remarkably like two portions of one and 

 the same seam. If they be so, the seam must have 

 been dislocated by a fault, which would account also 

 for the sudden deflection in the limestone boundary 

 and the return to its ordinary direction. A line is drawn 

 to represent provisionally such a fault, running through 

 the ascertained ends of the coal-crops, and coinciding 

 as nearly as may be with the doubtful limestone line 

 previously dotted on the map. Further evidence may 

 or may not be forthcoming. 



In traversing the Coal-measures area, between that 

 now surveyed and the river, we came across a mass of 

 rock quite different in character. The notes of this and 

 the mode of procedure connected therewith are deferred 

 for the present, and will be found at p. 213. 



