BR R. M. JOHNSTON, F.LS. 97 
vicinity of Mount Gell and Mount Hugel. The valley of 
Lake Dixon is, par excellence, the ideal of a perfect glacier 
valley. No one, however ignorant of glacial action, could in this 
neighbourhood gaze upon those beautiful scooped, or rather 
abraded, lakes or tarns (many with islets, as also observed 
by Mr. Montgomery in the region of Barn Bluff and Mount 
Pelion) ; the snow-white, polished, billowy, and cascade-like 
roches.moutonneés, composed of quartzites, on the upper 
margin of Lake Dixon, together with the tumbled moraines 
and large erratic on the lower banks—at a level of about 
2,000 feet— without being impressed with the idea that its 
singularly characteristic features must have been produced by 
the slow rasping flow of an ancient river of ice. 
The numerous beautiful lakes, many with wooded islets, 
on the lap and all around the base of the steep slopes, as at 
Mount King William I., the beautiful Lake Augusta under 
Eldon Bluff, Lake Petrarch in the romantic Cuvier Valley, 
lakes and lakelets near Mount Hobhouse, and southward in 
the Valley of Rasselas, as well as the clusters of lakelets at 
the head of Traveller’s Rest, and other sources of tributaries 
of the rivers Derwent, Gordon, King, and Pieman, are all 
eminently suggestive of being originally carved or sculptured 
by ice action during a former glacier epoch in Tasmania. 
The abundance of conclusive evidence so impressed me, 
that when I referred to them in the descriptive part of ‘‘ The 
Geology of Tasmania,’ I was content to summarise them 
merely as a general confirmation of the previous observations 
of Messrs. Gould and Sprent. Thus, at p. 164, in referring 
to the remains of our coal measures on the western crests of 
the Great Plateau, I state: ‘From information obtained from 
the Hon. J. A. Scott, now deceased, and from the appearance 
of their bold stratified ciiffs, as seen by the writer from 
Mount Arrowsmith, it would seem that, like the coal seams 
at Ben Lomond, Mount Nicholas, and Fingal, the coal 
measures of this basin are the remains of a deposit of con- 
siderable thickness and extent, lying at the higher levels 
against the flanks of elevated peaks of the ancient greenstone, 
that is, above the marine beds which also occur there in the 
same relative position as the places already mentioned. It 
is evident that the valleys intervening between the great 
greenstone plateau and the neighbouring isolated greenstone 
peaks have been carved out of this upper deposit and the under- 
lying (Permo-Carb.) marine beds. The work of denudation 
has been so vast that only fragments of this once more widely 
extended system, abutting against (or underlying) the green- 
stone, now bear evidence of their original extent. Both 
Mr. Gould and Charles Sprent bear testimony to the fact 
that glacial action at one time must have been an important 
