PERMIAN STRATA OF OPENSHAW. 127 



country between Manchester and Waterhouses^ showing 

 one great fault as then known. Afterwards, in vol. xii. 

 (2nd series) of our ' Memoirs/ evidence is given of another 

 fault at Medlock Vale, and lately, in part vi. vol. xv. of 

 the ^ Transactions of the Manchester Geological Society/ 

 Messrs. Bradbuiy and Atherton have shown a third fault 

 at Openshaw. As the district is thickly covered by drift 

 deposits, and few natural sections are exposed, we have to 

 wait till evidence is afforded by borings and sinkings. In 

 several papers by me, printed in the 'Memoirs,^ information 

 has been given as it was met with; and as Mr. John 

 Bradbury's boring is one of the most valuable, I wish to 

 add it to my other communications on the subject, in 

 order to make them more complete. 



Mr. Bradbury^s labours have shown the Permian sand- 

 stone, the one so well exposed at Vauxhall, in our city, to 

 be of greater thickness than hitherto proved in the 

 district ; and as this deposit is a most formidable difficulty 

 in sinking to the underlying coal seams, it is desirable 

 that all information respecting it should be given to the 

 public. 



The bore was made near to the Ashton canal in Open- 

 shaw, and adjoining the boundary of that township with 

 Clayton. According to Messrs. Bradbury and Atherton 

 it was as follows : — 



feet. 



Drift deposits 36 



Trias (Pebble-beds) 46 



Permian marls, containing beds of limestone, one of which 

 was I ft. 4 in. in thickness, and nodules of gypsum. In 

 the lower parts of the marls and limestones were shells 



of Schizodus obscurus, GerviUia antlqua, &c 200 



Conglomerate 3 



Permian sandstone 75Z 



Upper Coal Measures, contaiug r 2 beds of Ai'dwick Limestone, 



one of which is 5 ft. in thickness 263 



1300 



