LEVENSHULME LIMESTONE. 131 



the Permian measures dip gradually to the west, passing 

 regularly under the Trias at Withington. 



By reference to the Geological- Survey map it will there- 

 fore be seen that there is a most serious error in the plans. 

 The deep orange-colouring showing the Permians to the 

 east of the railway at Levenshulme must be altogether 

 erased and the New Red Sandstone substituted. Then, 

 again, the Permians must be shown commencing at Slade 

 Lane and extending for a considerable distance towards 

 Withington, where the New Red Sandstone is at present 

 shown. The line of fault from Heaton Norris to Colly hurst 

 must also be placed much further west, on the line of Slade 

 Lane. This fault is shown on the Geological- Survey map 

 at Heaton Norris as the prolongation of the great boundary 

 fault of the Manchester coal-field, being described as a 

 downthrow to the east of 200 yards. It will, however, be 

 evident from our new section that at Levenshulme it is 

 rather an upthrow-fault to the west, as the Permians are 

 brought to the surface, the Trias forming the platform to 

 the east, and also two miles to the west of it. 



The same fault is shown in the geological section of 

 Manchester as passing near All Souls Church, Ancoats, 

 where the Coal-measures are brought in to the east of it, 

 and the Permians lie in very nearly the position they occupy 

 at Levenshulme to the west of it. The same fault is again 

 shown at Collyhurst, where the Ardwick limestone comes 

 against it. The Collyhurst section is taken in very dis- 

 turbed and disputable ground, and cannot with any cer- 

 tainty be relied on. 



It is, however, clear, from a careful consideration of the 

 line of fault shown upon the Survey-maps from Heaton 

 Norris to Collyhurst, as altered by the new discovery at 

 Levenshulme, that the rest of its course will require care- 

 fully seeking out, as it is not easy to bring it in at either 



