1868.] 



MA>V VARIEGATED STRATA. 



363 



with pale blotches, &c., from a cutting on the Severn Valley Rail- 

 way, between Linley and Bridgnorth, similar to those in fig. 41 

 from near ShilFnal. 



Fig. 41. — Variegated Bunter Sandstone near SMffnal, ShrojpsMre. 



Analysis No. 1, of the red ground, indicated 



Water of combination 0-65 



Sesquioxide of iron 1-30 



Alumina 0*80 



Lime 0-35 



Magnesia 0*75 



Insoluble siliceous matter, sand 96"31 



10016 

 Analysis No. 2, of the pale blotches, indicated 



Water of combination 0*46 



Sesquioxide of iron 0*40 



Alumina , 0*36 



Lime , 0-26 



Magnesia 0*63 



* Insoluble siliceous matter, sand 98'15 



100-16 

 No important differences exist in the general composition of the 



red and bleached parts ; and the iron occurring in both was almost 



entirely in a state of sesquioxide. 



Sesquioxide of iron, in the light and dark parts of the Bunter 



Sandstone from the south of Bridgnorth, was found to be similarly 



proportioned : — 



* The insoluble siliceous matter in No. 2 consisted of 



Alumina and traces of oxide of iron 1 -97 



Lime 0*42 



Magnesia 0'40 



Silica 97-46 



100-2,5 



