Reports and Proceedings — Geological Society of London. 279 



land had proved the Old Eed Sandstone to consist of two great 

 divisions — a lower passing down conformably into the Upper 

 Silurian shales, and an upper graduating upward into the Lower 

 Carboniferous sandstones, with a complete discordance between the 

 two series. Mr. Jukes and Mr. Du Noyer had made out a similar 

 arrangement in the South-west of Ireland." And he adds, " The 

 lithological argument seems to favour the classification adopted by- 

 Mr. Jukes, for a great part of his Dingle beds would answer well for 

 much of the lower Old Eed Sandstone." 



Until we are able to study the succeeding parts of Professor 

 Geikie's memoir, we must be content with quoting the above 

 passage, which is significant when taken in conjunction with Mr. 

 Kinahan's researches. 



After a brief consideration of the condition of Western Europe 

 previous to Old Eed Sandstone times, Prof. Geikie passes on to the 

 consideration of the Lower Old Eed Sandstone, and its basins of 

 deposit in the British area. These basins he limits to five, termed 

 respectively, Lake Orcadie (including the whole of the Orkney 

 Islands), Lake Caledonia, or the Mid-Scottish Basin, Lake Cheviot, 

 the Welsh Lake, and Lake of Lome (Argyllshire, etc.). 



He observes, that in no part of its European distribution does the 

 Old Eed Sandstone attain the thickness and variety which it presents 

 in Scotland. The present part of his memoir contains the account of 

 the rocks in the area described as Lake Orcadie. It contains a table, 

 showing the vertical range of the known fossils of the Old Eed 

 Sandstone of Caithness, compiled chiefly from data furnished by 

 Mr. C. W. Peach ; and a list of the fossil fishes of the Lower Old 

 Eed Sandstone of the North of Scotland. A folding-plate gives 

 coloured sections of the strata of Shetland, Orkney, Caithness, Tarbat 

 Ness, Culloden Moor, Gamrie, etc. H. B. W. 



BBPOETS .A-ZEsTD IPIROCIEIEIDIIISrGrS. 



Geological Socifty of London. — I. — April 9, 1879. — Henry 

 Clifton Sorby, Esq., E.E.S., President, in the Chair. — The following 

 communications were read : — 



1. " On the Geological Age of the Eocks of the Southern High- 

 lands of Ireland, generally known as ' the Dingle Beds ' and 

 ' Glengariff Grits.' " By Prof. E. Hull, M.A., F.E.S., E.G.S. 



After reviewing the opinions of previous writers with reference 

 to the age of these beds, including those of Hamilton, Griffith, 

 Murchison, Kelly, Jukes, and the Officers of the Survey, which 

 showed that great uncertainty has hitherto prevailed, the author 

 quoted a passage of the late Prof. Jukes, in which he confessedly 

 left the determination of the age of these beds open for future 

 examination ; and he therefore determined to reinvestigate the 

 question, bringing to bear upon it the knowledge which had since 

 been acquired of other districts. For this purpose (and accom- 

 panied by Messrs. O'Kelly and M'Henry) he examined a series of 



