660 C. CALLAWAY ON A NEW AREA OP UPPER 



near Brampton Bryan. These have been noticed by Sir Roderick 

 Mnrchison and other authors, and have been commonly placed in 

 either the Lingula or the Tremadoc series. They occur in the same 

 line of strike as the Shineton Shales, and are close to the same great 

 south-west fault on the same (the south-east) side. They dip at 

 a high angle (about 45°) to the west or west south-west, and are 

 overlain by nearly horizontal May-Hill Sandstone, the relation of 

 the two formations being similar to their relation at Shineton. In 

 lithological character, the Pedwardine beds are un distinguishable 

 from the Shineton Shales ; and they contain in abundance a common 

 Shineton fossil, Lingulella Nicholsoni. It can scarcely be doubted 

 that the two shales are identical ; but, before offering further 

 comment, I will call attention to another locality. 



Upper Cambrian of Malvern. — The succession of Cambrian rocks 

 near White-leaved Oak, south of Malvern, in descending order, is as 

 follows : — 



1. Light-coloured shales with Dictyonema sociale, Salt. 



2. Black shales with numerous Olenids. 



3. Hollybush Sandstone. 



The uppermost group, the Dictyonema-shales, has been generally 

 considered the equivalent of the shales at Pedwardine, since it is 

 lithologically identical, and contains abundance of the same Dicty- 

 onema. I have examined certain specimens from these shales which 

 are in the museum at Malvern College, and in Dr. Grindrod's collec- 

 tion ; and I had the satisfaction of identifying them as Platypeltis 

 Croftii and Conophrys salopiensis, two Trilobites characteristic of the 

 Shineton Shales. These shales are also lithologically identical with 

 those of Shineton, and hold the same relation to the overlying May- 

 Hill Sandstone. They hold a similar relation to the Hollybush 

 Sandstone. I have recently discovered between the Shineton 

 Shales and the Wrekin a band of Hollybush Sandstone, which I 

 shall describe further on. This sandstone occurs below the Dicty- 

 onma-shales at Malvern with the interposition of the black Olenus- 

 shales. The juxtaposition of this sandstone to the shales at Shineton 

 and at Malvern is a strong corroboration of the evidence I have 

 adduced for the identity of the two shales. 



A comparison of the three formations at Shineton, Pedwardine, 

 and Malvern is very interesting. The Shineton beds are connected 

 with the Pedwardine shales by lithological resemblance, stratigra- 

 phical position, and the occurrence of Lingulella Nicholsoni. The 

 Pedwardine rocks are correlated with the Malvern Dictyonema-shales 

 by lithological resemblance, stratigraphical position, and the link of 

 Dictyonema sociale. The Shineton Shales are directly connected with 

 the Malvern beds by lithological resemblance, stratigraphical posi- 

 tion, and the occurrence of two species of Trilobites in common — 

 and indirectly through their correlation with the Pedwardine shales. 

 I think I may fairly conclude that the Dictyonema beds at Pedwar- 

 dine and Malvern are representatives of the Shineton Shales. 



The occurrence of Dictyonema sociale in the Shineton Shales at 

 Pedwardine and Malvern furnishes another link in the chain of 



