59 
ton. I wish to point out that this fact in no way invalidates 
the view which the Geological Surveyors have adopted ; but 
that the occurrence of coal at Brinnington under the sand- 
stone is quite compatible with the existence of a fault along 
the line of boundary to the eastward. 
A fault may produce a displacement of the beds of any 
indefinite amount, from one foot up to 5,000 — and the only 
effect of such a fault at the junction of the Carboniferous and 
Permian rocks at Brinnington, supposing the dip constant, 
would be to produce a greater or less vertical displacement 
of the beds, and to deepen the base of the red sandstone by 
that amount. On reference to the map of the Geological 
Survey it will be seen that at Harden Hall, and under the 
valley of the Tame to the northward, the boundary of the 
red sandstone is represented as a natural overlap, and not as 
a fault. That the red rock fault continues northward 
through the sandstone itself was, I think, proved at the col- 
liery worked some years since by Mr. Peten Higson, and I 
should be glad if this gentleman would give his views on 
the subject. From his statement I gathered that there was 
a fault to the westward of the pit, along which the beds 
were thrown into a vertical position. 
Further south, opposite Boynton Colliery, a tunnel was 
driven westward from one of the pits, which crossed a large 
fault, along which the measures were dislocated and oxidised. 
In the Appendix to the Memoir alluded to by Mr. Binney 
(“ On the Geology of the Country around Stockport, Maccles- 
field, &c.”) will be found an account of this fault as given 
me by Mr. Greenwell, F.G.S. There is every reason for 
supposing that this was “the red rock fault,” or one in 
proximity to it ; for a great fracture such as that I here 
refer to is often accompanied by minor dislocations. South 
of Macclesfield the fault was actually seen by Mr. Green, of 
the Geological Survey, who has represented the section by 
a figure in the Memoir (Fig. 2). From this spot the amount 
