534 ,/. T. Jut son : 



northern ends. Tlie explanation appears to be that the hiteral 

 pressure which produced the folds, produced different results. 

 At Warrandyte a great arch was formed, but the pressure con- 

 tinuing, the strain was relieved in one part of the field by the 

 wrinkling of the crown of the arch. A little to the north, 

 great pressure seems to have come from the east, with the 

 result that the strata of the eastern leg of the great fold were 

 bent towards the central axis, and acquired a north-westerly 

 strike, losing their normal strike, which is north-easterly. 

 The several small folds which occur to the south, appear to 

 have been squeezed towards one another, and eventually to 

 have merged in the northern continuation of the Main South 

 Anticline. Farther to the west the fold of the Main North An- 

 ticline commenced. This anticline, where it overlaps the Main 

 South Anticline, may be due to the pressure from the east 

 already mentioned. 



To the north of the area where the strata are squeezed to the 

 north-west, the strike becomes north-easterly again, as shown 

 along the Yarra towards Watson's Creek. The anticlinal axis 

 which crosses a great bend of the river, as shown on the en- 

 larged map of Warrandyte, although represented by a fine fold 

 on the river bank, soon dies out to the north, whilst to the 

 south, an east and west line would join the southern end (so far 

 as traced) of this fold and the northern end of the Main South 

 Anticline. This fact, together with the ditierence in the strike of 

 the rocks, suggests a fault along this connecting line, caused by 

 the intense pressure from the east, of the strata which now 

 form the northern end of the Main South Anticline. 



To the north of Warrandyte, the pressure relaxed, with the 

 result that the axial lines widen, and the Main North Anticline 

 develops into a broad fold with a western leg divided into two 

 normal folds, whilst the eastern one is undisturbed and un- 

 fractured for several miles. 



To the south of Warrandyte, normal folds have resulted 

 without any intense folding or contortion. 



At Warrandyte, therefore, the great pressure has caused the 

 formation of a number of small folds along which, as would 

 be expected, fracture has taken place. Thus Prof. Gregory's 



