Geological Society of London. 41 



The Budleigh Salterton Pebble-beds, with overlying sandstones 

 and pebbly beds, he assigns to the horizon of the Pebble-beds of the 

 Midland area, and points out that fossils of Silurian and Devonian 

 types occur in the pebbles of both areas. 



The Upper Division of the Bunter is well shown at Sid mouth, and 

 the author takes a calcareous breccia, two feet thick, which is found 

 in the cliffs, as the basement bed of the Keuper division. 



3. "Supplementary Note to the Paper on the ' Eed Rocks of the 

 Devon Coast-section,' Q.J.G.S. 1888." By the Rev. A. Irving, 

 D.Sc, B.A., F.G.S. 



In this note the author accepts Prof. Hull's determination (see 

 above) of the breccia at Sidmouth as the base of the Keuper, and 

 discusses the age of the sandstones containing vertebrate remains 

 discovered by Messrs. Whitaker, Metcalfe, and Johnston-Lavis. He 

 brings forward evidence in support of his view that these are really of 

 Upper Bunter age, notwithstanding the character of the organisms. 



He adds new material in support of his contention that the sand- 

 stones and marls which Prof. Hull assigns to the Lower Bunter 

 are really Permian ; but he is inclined to think that the breccias 

 (in part, at least) pass laterally into the sandstones, and do not 

 underlie them. 



From this it follows that the break between the Permian and 

 Trias of Devon is marked by the absence of the Lower Bunter of 

 the Midlands, and the author quotes remarks of Mr. Ussher in sup- 

 port of his view that there is an unconformity at the base of the 

 Pebble- bed. 



In conclusion the author refers to the difficulties of ascertaining 

 the exact age of the breccias, and notes that we cannot prove that 

 the highest Carboniferous beds are present in Devonshire. He 

 observes that there is no valid reason why the great breccia-sand- 

 stone series of Devon should not be the true equivalent of the Lower 

 Eothliegendes both in time and position in the sequence, and that 

 some portions of them may be even older than the Rothliegendes of 

 some districts. He discusses the evidence furnished by the igneous 

 rocks, and points out the abnormal position both for the British and 

 German areas which these would occupy, if the breccias were of 

 Triassic age. 



Ill— December 9, 1891.— Sir Archibald Geikie, D.Sc, LL.D., 

 F.R.S., President, in the Chair. — The following communications 

 were read : — 



1. " On the Rocks mapped as Cambrian in Caernarvonshire." 

 By the Rev. J. F. Blake, M.A., F.G.S. 



In this paper the following is given as a definite succession in the 

 Cambrian series: — 1. Pale Slates; 2. Upper Purple Slates; 3. St. 

 Ann's Grit ; 4. Lower Purple Slates ; 5. Rhiw-wn Grit ; 6. Hard 

 banded Pale Slates and Halleflintas ; 7. Bangor Conglomerate ; 

 8. Hard banded Pale Slates and Halleflintas; 9. Bangor Breccia; 

 10. Blue blanded laminated Grits; 11. Tairflfynnon Conglomerate; 

 12. Blue banded laminated Grits; 13. Brithdir quartz-felsite Grit. 



