Geological Society of London. 329 



Above the latter comes the '•'volcanic series," well developed in the 

 neighbourhood of Bangor. The author is of opinion that the Cam- 

 brian conglomerate, with associated grits, may be traced in the edge 

 of the older massif from Twt Hill, Caernarvon, to Garth Point, 

 Bangor, and that the beds in each of these places and near Brithdir, 

 recently described as separate, are identical ; also that the bed with 

 purple fragments near Tairffynnon and the Bangor Poorhouse are 

 only Cambrian conglomerate faulted down. Further, he considers 

 that the strata of the above three series are fairly parallel through- 

 out, and that they only form three subdivisions of one great series. 



2. " Notes on the Structure of the Palaeozoic Districts of West 

 Somerset." By A. Champernowne, Esq., F.G.S., and W. A. E. 

 Ussher, Esq., F.G.S. 



The authors confirmed the general accuracy of Mr. Etheridge's 

 views as to the structure of North Devon and West Somerset, but 

 differed from him in ascribing the limestone of Cannington Park to 

 the Carboniferous, both on account of lithological character, the 

 fossils in Taunton Museum, said to be obtained from it, and the 

 latitude of its position with reference to the Carboniferous Lime- 

 stone of the Mendip, South Wales, and the steep and fiat Holmes. 

 They described four traverses made by them in West Somerset. 

 1st. From Dulverton to Dunster, in which, proceeding northwards, 

 the following beds were encountered: — Culm -measures faulted 

 against Pilton Beds (Upper Devonian), Pilton Beds faulted against 

 Pick well Down Sandstone (base of Upper Devonian), Pick well 

 Down Sandstones becoming slaty in passing into Morte slates 

 (Middle Devonian) and troughed in them by faulted synclines, 

 Morte slates passing into Ilfracombe slates (overlying Hangman 

 grits) near Cutcombe, Hangman Grits, evidently faulted against 

 Foreland grits, as no representative of the Lynton beds is present 

 between Oaktrow and Timberscombe. 



In traverse 2, the fault between the Hangman and Foreland grits 

 is proved by the presence of the Lynton beds in the vallejr west of 

 Luccot Hill and their conformable infraposition to the Hangman 

 series, and abrupt termination by fault against the Foreland grits of 

 Porlock and Oare Hills. At Oare a patch of schist of the Lynton 

 zone was noticed resting on the Foreland grits on the north side of 

 the fault. 



The 3rd traverse in the Tone valley gave the following succession 

 of beds : — Culm-measures on Pilton beds ; Pilton beds with grits, 

 much flexured, on Olive slates with Lingula and grits with Cucullcea, 

 conformably overlying Pickwell Down grits, which make a con- 

 formable junction (following the feature) with the underlying 

 quartziferous slates of the Morte series (Middle Devonian) ; the latter 

 were observed between Huish Champflower and Clatworthy ; but, 

 as the Middle Devonian slates appear to extend considerably north- 

 ward in the Brendons, they were not traversed beyond Clatworthy. 



The 4th traverse from West Quantockshead to Cannington Park 

 proved the composition of the Quantocks along that line to be grits, 

 in places associated with schistose shales, apparently belonging to 

 the Hangman series (Middle Devonian) ; whilst the Palaiozoic 



