208 GEOLOGY OF SHROPSHIRE. 



Pedwardine shales by litliological resemblance, stratigrapliical position, 

 and the occurrence of LingulcUa Nicholsoni. The Pedwardine rocks are 

 correlated with the Malvern Dictijonema shales by lithological resemblance, 

 stratigi-aphical position, and the link of Dictijonema sociale. The Shineton 

 Shales are directly connected with the Malvern beds by lithological 

 resemblance, stratigraphical position, and the occurrence of two species 

 of Trilobitos in common ; and indirectlij through their correlation with 

 the Pedwardine Shales. I think I may fairly conclude that the 

 Dictyonema beds at Pedwardine and Malvern are representatives of the 

 Shineton Shales. 



The occurrence of Dictyonema sociale in the Shineton Shales at 

 Pedwardine and Malvern furnishes another huk in the chain of palaconto- 

 logical evidence. This species is common at the base of the Lower 

 Tremadoc of North Wales, and helps to connect that formation with the 

 Shineton Shales. Taken by itself, the occuiTence of a single species may 

 not be decisive ; but, when other lines of evidence converge to the same 

 point, this fact is of value. 



The Black Shales of Malvern are correlated by their fossils with the 

 DolgeUy group, the uppermost zone of the Lingula Flags. 



It may be concluded from a review of the evidence that the Shineton 

 Shales are at least as old as the Lower Tremadoc. 



The Hollybush Sandstone. 



Forming a continuous band between the Shineton Shales and the 

 quartzite which rests upon the Wrekin, is a series of thin-bedded, 

 micaceous, gi-een sandstones, holding the same geographical relation to 

 the Shineton Shales as the Hollybush Sandstone of ;Malvern holds to the 

 black Olenus Shales. The identification of this rock with the Hollybush 

 is placed beyond doubt by the further evidence of Kutonjina cinguhiia 

 and SerpuUtes fistula, which occm" in good i^reservation at Neves Castle, 

 at the south-west end of the Wrekin. The sandstone is also found at 

 LiUeshaU, five miles to the north-east of the Wrekin, where it forms an 

 inher a rniie long by a quarter of a mile wide. Since the reading of my 

 paper I have also discovered it on the south-east flank of Caer Caradoc, 

 near Church Stretton. It is well exposed in a quarry at the north-east 

 end of the hill, and contains a thin band of hmestone with Kutonjina 

 cingulata, Serpidites fistula, and other fossils, and holds its normal place 

 betwen the quartzite and the Shineton Shales. 



Details of the Hollybush Sandstone as well as of the Shales will be 

 found in my published paper. 



Fauna. 



I append a list of the Upper Cambi-ian fossils found in South 

 Shropshire, most of which it will be seen ai-e new to science. They are 

 described and figured in my paper : — 



Ckustacea. ' 



Asaphus (Asaphellus) Homfi-ayi, Salt. Shineton Shales. 



Asaphus (Platypeltis) Croftii, Call., gen. et sp. Shineton Shales. 



Agnostus dux, Call. Shineton Shales. 



CouocoiTphe mouile, Salt. Shineton Shales. 



