614 



ME. D. C. EVANS ON THE ORDOVICIAN [Nov. 1906, 



bands of ash. Cone-in-cone structure is very common in the grit- 

 bands, as well as in nodules embedded in the mudstones and shales ; 

 this is especially the case in the neighbourhood of St. Clear's. 



Beds of this age occupy a considerable space, both north and 

 south of the 2 y etragraptus-belb. 



(1) The Southern 



and Bronheulo 



Outcrops. — These beds are much in 

 . evidence at St. Clear's. The main 

 road cuts through them at Blue 

 Boar, and there is a good section up 

 the hill leading to Lower St. Clear's. 

 This latter exposure shows the dis- 

 turbance mentioned above (p. 613). 

 There are good sections also in the 

 old lane near Croft Lodge, and along 

 the Cliff, where the Didymograptus- 

 hifidus Beds are faulted against 

 black Dicranograptus-Beds. 



The general dip about here sug- 

 gests an overfold from the north, as 

 Didymograptus-biftdus shales appear 

 to pass under older beds. This is 

 the case not only here, but all 

 along the strike. Fossils are fairly 

 common. The main-road section 

 and that in the ' old lane ' are per- 

 haps the best places for collecting. 



The following occur on the main 



road 



Didymograpius bifidus, Hall. 

 Dklymograptus euodus (!) Lapw. 

 Didymograptus Nicholsoni, Lapw. 

 Didymograptus Nicholsoni, var. 



planus, Elles & Wood. 

 Agnostics M' Coyi, Salter. 

 Mglina binodosa, Salt. 

 JEglina (young ?). 

 Calymene parvi.frons, Salt. 

 Tlaco'paria cambrcnsis, Hicks. 

 Illcenus Hughesii, Hicks. 

 Orthoceras cf. caereesiense, Hicks. 

 Theca sp. 

 Conularia sp. 



these 



Bellerophon midtistriatus (!) Salt. 



The ' old lane ' has yielded the 

 above, and also the following : — 

 Didymograptus (?) geminits, His. ; 

 Phacops llanvirnensis, Hicks ; Bel- 

 lerophon sp. (young?). 



East of St. Clear's, at Plasygwyr 

 mudstones are associated with a series of 



