Reports and Proceedings — Geological Society of London. 87 



2. "A Contribution to the Glacial Geology of Tasmania." By 

 Professor J. Walter Gregory, D.Sc, F.K.S., F.G.S. 



On reading the literature on the glaciation of Tasmania, the author 

 came to the conclusion that, except for such traces of high-level 

 glacial action as those of Mount Sedgwick recorded by E. J. Dunn 

 and T. B. Moore, and those near the summit of Mount Ida recorded 

 by Officer, Balfour, and Hogg, the evidence consisted of material 

 that was either not of glacial origin or was due to glacial action at 

 some upper PalEeozoio date. After giving a detailed analysis of the 

 previous contributions to this subject, the author describes the 

 evidence obtained by himself personally in the northern portion of 

 the island. The town of Gormanston stands on a glacial moraine of 

 recent geological age, formed later than the excavation of the Linda 

 Valley, and occurring as a bank projecting from the southern side of 

 the valley and nearly damming it across. The moraine is composed 

 of typical Boulder-clay, and behind it are bedded clays which 

 probably accumulated in a glacier-lake above the moraine-dam. An 

 erratic of fossiliferous limestone, 4^ by 3^ by 2| feet, scratched all 

 over and partly polished, is mentioned, while the North Lyell 

 Railway has cut through an enormous boulder of black Carboniferous 

 Limestone at least 16 feet in length. The northern face of Mount 

 Owen appears to be ice-worn to the height of about 1900 feet, while 

 the basis of the glacial deposits is not more than 700 feet above the 

 sea. The general evidence suggests that the Eldon Eange and the 

 Central Plateau formed the gathering-ground of the ice which flowed 

 westward and south-westward. A map is given to show the range 

 of Pleistocene glaciation so far as it has been recorded, and also to 

 indicate localities at the glacial deposition which probably dates from 

 the Carboniferous Period. The lowest level at which evidence of 

 Pleistocene glaciation has been found is 400 feet on the Pieman 

 Eiver. This latest glaciation is later than the formation of the 

 peneplain of North- Western Tasmania, and occurred after the 

 dissection of this peneplain had begun. Many of the deposits are 

 little more altered than those of Northern England, despite the 

 heavy rainfall; and the aspect of some of the rock-scoring is very 

 recent. 



IL— December 16th, 1903.— Sir Archibald Geikie, D.C.L., D.Sc, 

 Sec. K.S., Vice-President, in the Chair. The following com- 

 munications were read : — 



1. " The Igneous Rocks associated with the Carboniferous Lime- 

 stone of the Bristol District." By Professor Conwy Lloyd Morgan, 

 LL.D., F.R.S., F.G.S., and Professor Sidney Hugh Reynolds, M.A., 

 F.G.S. 



Evidence for the contemporaneous origin of the igneous rocks is 

 given for the following localities : — Middle Hope, or Woodspring ; 

 Spring Cove, near Weston-super-Mare ; above Kew Stoke, Milton 

 Hill; Uphill; Goblin Combe; and near Cadbury Camp. At 

 Middle Hope the ejectamenta thin to the east, and lava is only 

 found to the west ; at Spring Cove small lapilli were found in the 



