The Country round Lyell the Goal-Field 



are known locally as the "top seam" and the "bottom 

 seam," and we shall retain these names, as to introduce 

 others might lead to confusion. The whole of the strata 

 dip south-south-west at 10. 



From our measurements and general survey of the 

 hill we were now able to construct the following section 

 (Fig. 19). 



The seams were worked from the low side so as to 

 allow of easy haulage, and also so that the water might 

 readily drain away without the necessity of pumping. 



Several bore-holes had been put down in the plain 



FIG. 19. Section of Coal Hill. 



at the points marked B.H. on the map, but, although in 

 some instances they had reached a depth of over 1000 

 feet, none of them proved any workable coal. In fact, 

 the deeper they went, the less favourable the conditions 

 appeared. 



Doubtless at one time the seams of Coal Hill ex- 

 tended over the whole field, but they have been removed 

 by denudation, so that only the small outlier remains. 



We had noticed that the strata were dipping towards 

 the south-south-west, and it was therefore possible that 

 the seams might come down to the level of the plain in 

 that direction. 



125 



