70 REPORT — 1877. 



1. The raetamorpliic character is more prevalent there than in Belgium, especially 

 in the Middle and the Upper Devonian. 



2. All this series is perfectly continuous from Barnstaple to Lynton. Nowhere is 

 there a reappearance of such identical rocks as to prove by repetition of the series 

 the existence of a fault. 



3. The Sandstones of Baggy Point and Marwood (Cucullcea zone) perfectly agree, 

 both lithologically and palseontologicallv, with certain portions of our " Psarnmites 

 du Condroz." The Red Sandstones of Pickwell Down correspond to the lower part 

 of these Psarnmites, 



4. The limestone of Ilfracombe represents, as already stated on palaeontological 

 evidence, the Stringocephalus limestone (Calcaire de Givet) of Belgium and Germany, 

 ■while the lithological appearance of the rock is very distinct. 



Hence it is easy to compare this part of the Devonian series with that of the Con- 

 tinent. In this respect I differ but little from Mr. Etkeridge. 



5. The Devonian limestones are much more abundant on the Continent than on 

 this side of the Channel. I think, moreover, that the same is to be said of the Car- 

 boniferous formation — that is to say, that the Mountain limestone is replaced in North 

 Devon (at least in part) by the beds of Barnstaple and Pilton. I found in the slates 

 of Pilton, beds and nodules of siliceous concretions (phthanites'), which represent, I 

 think, the chert of the Carboniferous limestone, or the so-called phthanites of our 

 " Calcaire carbonif ere. " 



B. As to the Old Bed Sandstone, I spent a week in Hereford, but saw very little 

 of it. I coidd only examine conveniently the cornstones, of which I had from the 

 descriptions a very imperfect notion. Such limestones occur identically in Belgium, 

 with red shales, sandstones, and conglomerates, in the northern trough, or " Bassin 

 de Namur"*. 



This fact seems to me of the highest value, for it leads me to this paradoxical 

 conclusion, viz. the Old Bed Sandstone of the United Kingdom is a marine forma- 

 tion, probably formed in the same ocean as the Devonian. The Old Bed of Belgium, 

 with the cornstones exhibited, lies regularly between limestones with Stringocephalus 

 Burtiiii and others with Spirifer disjunctus. That is certainly a marine formation ; 

 the same must be the case with the English Old Bed Sandstone. 



Oti some of the StochworTcs of Cornwall. 

 By C. Le Neve Foster, B.A.,D.Sc, F.G.S. 



The author divided the Tin Stockworks into three classes, according as they occur 

 in killas, granite, or elvan, and then described the mode of occurrence of Tin-ore at 

 some of the most important of them. 



The following is a list of the 'Stockworks referred to :— Killas Stockivorks, Wheal 

 Prosper, Mulberry, Minear Downs, Park of Mines, Polperro, Trevaunance, Wheal 

 Coates, Great Wheal Fortune. 



Granite Stockivorks, Carclaze, Carrigan Rock, Belowda Hill, Rock Hill, Cligga, 

 Balmynheer, St. Michael's Mount. 



Elvan Stockworks, ~HohV a Hill, Castle-an-Dinas, Terras, Gover, Budnick, Rose- 

 warne, Wheal Jennings, Poldoiy, Wherry! (See Quart. Journ. Geol. Soc. vol. xxxiv. 

 1878, Aug.) 



On some Tin-Mines in the Parish of Wendron, Cornwall. 

 By C. Le Neve Foster, B.A., D.Sc, F.G.S. 



The author described the Tin-deposits of the following mines : — Balmynheer, 

 The Lovell, and South Wendron. 



At Balmynheer there is a mass of stanniferous rock 3G fathoms long, and 30 or 40 

 feet thick, dipping N. It is mainly a mixture of quartz, chlorite, gilbertite, iron- 

 pyrites, and tinstone. 



* Specimens from England, and others from Belgium, were exhibited. They were all 

 recognized as cornstones. 



