140 



In the fourth section, at Ordsal, Messrs. Worrall found 

 the trias beds 460 feet in thickness without going through 

 them. At the bottom of the bore the water became so salt 

 that they discontinued the work, it being no longer fit for 

 dyeing and such like purposes. This is the first instance, to 

 the Author's knowledge, where salt water has been met with 

 in the trias near Manchester. 



The fifth and sixth sections were at Skillaw Clough and 

 Bentley Brook, to the north of the Newburgh station on the 

 Manchester and Southport Railway. These were some time 

 since discovered by Mr. E. Hull, B.A., F.G.S., of the Geolo- 

 gical Survey, and described shortly by that gentleman in the 

 sheet explaining the map of the district. Further particulars 

 were given of the details of both sections, and an analysis of 

 the limestone was produced, which showed it to differ in its 

 chemical characters from the thin ribbon bands found in the 

 permian marls near Manchester, Patricroft, Astley, and Leigh, 

 and was very like the yellow magnesian found at Stank, in 

 Furness, North Lancashire. Probably it might prove to be 

 a different bed, and more like the great central deposit of 

 magnesian limestone of Yorkshire than the thin beds pre- 

 viously alluded to. 



