
80 Geological Society. 
In the Haweswater district there is an intercalation of rocks of 
the Eycott type with rocks possessing the ‘streaky’ structure. 
This intercalation appears to be original, and not the result of 
subsequent earth-movements. 
The garnets are of the almandine-type. They often have a ring 
of felspar around them, which, when the intrusive rocks are studied, 
suggests that the mineral is original; but similar rings occur around 
garnets in the ashes, showing that the felspars may be formed 
in solid rock. In certain ashes of the Haweswater district, the 
existence of cavities in the garnets suggests a metamorphic origin 
for the mineral, but it is difficult to understand how the meta- 
morphism has been produced. 
The paper closes with a description of certain undoubted meta- 
morphic changes. 
2. ‘A Contribution to the Glacial Geology of Tasmania.’ By 
Prof. J. Walter Gregory, D.Sc., F.R.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 Paleozoic 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, 43 by 33 
by 24 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 base of the glacial deposits is 
not more than 700 feet above the sea. The general evidence 
suggests that the Eldon Range 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 of 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 
River. This latest glaciation is later than the formation of the 
peneplain of North-Western Tasmania, and occurred after the dissec- 
tion 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. 

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