June, 1907.] THE VICTORIAN NATURALIST. 33 



character, rounded outline, and gentle slopes contrast them 

 strongly with the deep rocky gorges of the main streams of the 

 district. The continuity of the old strike valleys along or near 

 the anticlinal axis appears to have been much broken by the 

 headward advance, from both sides, of tributaries from the deep 

 valleys of the Macallister on the west and the Avon and 

 Wonnangatta on the east. 



If for simplicity the prevailing direction of the main streams of 

 this area be indicated by straight hnes, a series of more or less 

 rectangular blocks of varying size is noticeable. This results from 

 sharp change of direction of many streams from a strike direction 

 to one at right angles. In reality the corners and edges of these 

 rectangles have been much rounded off, but still the block-like 

 arrangement of the intervening country is more or less marked 

 throughout the district. Many of the approximately north and 

 south lines are clearly traceable to the strike of the rocks, but in 

 some cases also to faulting in a similar direction, notably in the 

 Macallister valley. The east and west lines have probably been 

 determined in the main by well-developed joints roughly at right 

 angles to the strike ; perhaps also to cross fracture and faulting, 

 though these latter features have not yet been established. This 

 block-like dissection of the country is what might well be expected 

 from well-known principles of stream evolution, when the geolog- 

 ical structure of the region is realized. The old high-level strike 

 valleys, less active than their more favoured neighbours, must 

 eventually be invaded by the headward erosion of the lateral 

 streams of the deeper valleys. The right-angled bends and gaps 

 through the ridges illustrate this feature strikingly throughout the 

 district. 



Many features present themselves for study in this region, but' 

 the difhculty of the country makes the progress of collecting 

 necessary data very slow and laborious. Further remarks, there- 

 fore, on many suggestive points must be postponed for the present. 



In conclusion, I desire to express my thanks to Mr. G. Ampt, 

 for the careful record of aneroid readings throughout the trip ; to 

 Mr. V. R. M'Nab, for constant assistance in exploring the 

 numerous slopes that had to be climbed ; to Mr. J. Dunn, of 

 the Lands Department, for all the available topographical features 

 of the area, which, though scanty, formed some basis for the 

 sketching in of further details ; and finally to Messrs. J. 

 M'Michael, Peden, and Macfarlane, for true bush hospitality, 

 and also to the latter for guidance and help in the serpentine 

 area. 



The views selected for reproduction are : — 



No. I. — View of Tali Karng, looking east from Echo Point, on 

 Riggall's Spur. The lake is half hidden by the upper part of the 

 Barrier. Its area is about 23 acres, with a greatest depth of 150 ft. 



