38 MR. E. W. BINNEY ON THE 



proved them to be part of the upper or Manchester coal- 

 field_, in fact the Ardwick limestones — thus showing a band 

 of carboniferous strata containing coal running under the 

 trias and permian beds to the south of Manchester. This 

 is of great importance, and proves that coal-measures are 

 met with at places under trias and permian deposits much 

 nearer the surface than was previously expected, and 

 where the upper rocks give no evidence of their proximity. 

 From the banks of the Medlock southward, the trias was 

 proved to thicken, as shown at Messrs. Hoyle's works, 

 Mayfield, where it was 143 feet 4 inches thick ; and farther 

 south still, at the late Mr. Green's dye-works in Garratt 

 Road, it was penetrated 324 feet in thickness, without 

 going through it. The position of this bore is about 500 

 yards to the north of Messrs. Fryer and Co.'s. On taking 

 the line of the great Irwell fault where last seen, in the 

 workings of the Pendleton Colliery, and continuing it south- 

 ward to the -fault previously described in this paper at 

 Heaton Norris, it would appear to run nearly through 

 Messrs. Fryer and Co.'s works, and would account for the 

 occurrence of the beds there met with; but the bore of 

 Messrs. Worrall at Ordsal to the west, hereinafter alluded 

 to, shows that the trias there is far thicker than we should 

 expect would be the case, for it was penetrated 460 feet 

 without its thickness being ascertained. 



In continuing the great fault of Newtown and Colly- 

 hurst southward, and assuming that dislocation to have 

 been made subsequent to the formation of the Pendleton 

 fault, the permian and trias beds may have been thrown 

 down, so as to account for a break in the great Irwell 

 fault between Ordsal and Chester Street, and thus allow 

 of the thickness of the trias at Ordsal. However it may 

 have been brought about, there is no doubt that the Ard- 

 wick coal-measures last seen in the bed of the Medlock 

 near Schofiekrs Chapel, and disappearing under the per- 



