602 J. G. GoodcJiild — Deutozoic Rocks of North Britain. 



Furthermore, there is a wide divergence in the strikes of the two 

 series, and the volcanic rocks dip, as a whole, in the opposite 

 direction to that of the sediments. Dr. Marr made a very important 

 discovery of sediments of Lower Bala age, the Drygill Shales, near 

 the margin of these. I still think that these Drygill Shales may 

 lie unconformably upon some part of the Skiddaw Slates, and for 

 a long time thought that the set of volcanic rocks at present under 

 notice might possibly belong to an horizon near to that of the 

 Dr^^gill Shales. However, recent visits to the Caldbeck Fell area, 

 with the facts summarised in the foregoing part of this paper in 

 mind, have led me to alter that opinion. Therefore, although I am 

 not aware as yet of any palasontological evidence which tells 

 either the one way or the othei", the balance of field evidence seems 

 to me now to indicate that the volcanic rocks in question may 

 really be of the same age as the Caledonian Old Ked, 



The strip referred to is that which, lying within the Carboniferous 

 frame on the north side of the Lake District, stretches, everywhere 

 with a strike discordant to that of the adjoining Skiddaw Slates, 

 from Uldale, past Caldbeck, through the Caldbeck Fell mining 

 area, to Carrok Fell, and is continued as faulted inliers at two 

 places near Greystoke Park, including the well-known patch which 

 is locally called Berrier Nittles, but which Mr. Ward referred to as 

 Eycott Hill. 



There is nothing in either the petrographical or the lithological 

 characters of these rocks which would definitely link them on with 

 the true Arenig-Llandeilo rocks which occur between Keswick and 

 Ambleside, or Ullswater and Shap. On the other hand, the volcanic 

 rocks in question agree in both petrographical and lithological 

 characters with the volcanic rocks which form the Cheviot Hills, and 

 they appear, as the Caledonian Old Red rocks do everywhere, to lie 

 with a violent unconformity upon any rocks older in the series with 

 which they may come into contact. 



Whether any of the volcanic rocks near Melmerby can also be 

 referred to this horizon is a question I hope to be able to answer soon. 



E. H. Traquair, "Notes ou the Nnmouclature of the Fishes of the Old Red Sand- 

 stone of Great Britain": Geol. Mag., Dec. Ill, Vol. V (1888), 

 pp. 507-517. 



"Outhe British Species of Asterolepidte " : Proc. Eoy. Phys. Soc. Edinb., 



vol. xi (1892), pp. 283-286. 



" On the Discovery of Cephalaspis in the Caithness Flags " : Ann. Scott. 



Nat. Hist., Oct. 1893, pp. 206-207. 



" Achanarras Revisited " : Proc. Roy. Phys. Soc. Edinb., vol. xii (1894), 



pp. 279-286. 



" The Fossil Yertebrata of the Moray Firth Area " : contained in Harvie- 



Brown & Buckley's " Fauna of the Moray Basin," Edinburgh, 1896. 



"Note on the Fossil Fishes of the Old Red Sandstone of Scotland": 



contained in Mem. Geol. Surv., "Geology of Lower Strathspey" 

 (Explanation of Sheet So), 1902, pp. 81-82. 



