112 
Permiaa Marl, Coal Measures Sandstone, Millstone Grit, 
Quartzite, and Quartz. 
It would be foreign to the purpose of this communication 
were we to enter at large upon the vexed question of the 
value of the supposed breaks in the succession of the 
beds included under the comprehensive, but convenient, 
denomination of the Poikilitic series, but strictly limiting 
the application of our remarks to the immediate vicinity of 
Stockport, no satisfactory evidence has yet been adduced to 
prove the existence of any considerable stratigraphical 
break between the Permian beds and the overlying Bunter. 
The deductions of the surveyor were apparently drawn from 
inadequate information. It will have been noticed that in 
describing the section we have not ventured to make any 
definite assertion regarding the precise point at which the 
Permian beds are succeeded by the Bunter, but have offered 
as alternatives the view that the top of the great marl bed 
30 feet N.N.W. of the Brook Street shaft, or the top of the 
14in. marl bed further on, may be taken. In either case the 
evidence of nonconformity is inconclusive; for if we take, 
the lower horizon, then, with a scarcely perceptible change 
of dip, we have an absolutely identical lithological com- 
position, the upper marl being indistinguishable from the 
lower, while if we draw the line at a higher point, the dips 
are exactly conformable, 
