8 DR. J. E. MAKE ON THE LOWER [March 1913, 



beds are of doubtful age, as no characteristic forms of either Ash- 

 gillian or Caradocian strata have been found ; but the lithological 

 -characters and the general nature of the fauna suggest that the 

 beds are Ashgillian, and belong to the Staurocephalus division. The 

 Tock is a grey encrinital limestone, weathering to an ashy-looking 

 olive-green and brown rottenstone. It yielded :— 



Eemopleurides. I Cybele verrucosa. 



Phillipsinella parabola 'V . j Phacops (Chasmops 1) sp. 



Lichas laxatus. Orthis (several species). 



Illtsnus bowmanni (I). | Strophomena corrvgatclla (]). 



If the beds on Sally Brow are high up in the Calymene Group, as 

 .suggested, the newer age of these footbridge strata is rendered still 

 (more probable. 



We will pass now to the southern limb of this syncline, where the 

 beds are Avell developed in theRawthey, above and below the mouth 

 of Sally Beck. 



Above Kawthey Bridge, the section in the neighbourhood of the 

 fault which lets down the Carboniferous rocks is obscure, but there 

 is a general ascending succession down stream. Phacops robertsi 

 was found in a cliff 100 yards above the bridge, in unctuous grey 

 shales associated with light-coloured limestones, and the same fossil 

 occurred under the bridge itself. About 30 yards lower down the 

 stream, a small cliff on the left bank shows the beds in a weathered 

 condition, and here fossils are plentiful. We found: — 



Turrilepas. | Phacops. Two other species. 



Eemopleurides (Caphyra) sp. 1. Orthis. 



Phacops robertsi (very abundant). 



It is doubtful whether any of the beds up stream belong to the 

 'Calymene Group, but the fossiliferous beds just described are un- 

 doubtedly the Phacops-robertsi Beds. 



Continuing down stream, on its left bank we observe a continuous 

 exposure for a long distance. The beds above described pass into 

 blue flags, which are penetrated by a lamprophyre. These, from 

 their position and characters, are the lower division of the Stauro- 

 cephalus Group, but have here yielded no fossils. No sign of the con- 

 temporaneous volcanic rocks was seen here, apart from the general 

 ashy appearance of the calcareous shales, and Dr. Strahan has 

 shown that the volcanic rocks die out southwards, Above the blue 

 flags are olive-green ashy-looking mudstones resembling the beds 

 above the volcanic group of Backside Beck. They set in near the 

 eastern end of the wood which skirts the right bank of the stream, 

 and are continued down stream until near the western end of the 

 wood. The following fossils were found in these, the upper division 

 of the Staurocephalus Beds (beds above the volcanic group) : — ■ 



Dicellograpzus anceps. 

 Glyptoyraptus persculptus. 

 (Climacograptus normalis. 

 Trinuclcus buchlandi Bare. (?). 

 Dindymene hughesics (1). 



Cybele rugosa var. attenuata (1). 



Orthis. 



Leptcena. 



Tentaculites anglicus. 



