462 E. C. ANDREWS. 



spots of slight uplift and strong stream action that the 

 streams held their own against the upward movement. 



The submergence which formed the harbours is seen to 

 have been rapid in action owing to the unsilted condition 

 of inlets of the Port Jackson type. By this action also the 

 continental shelf was widened, and the shore line carried 

 westward. The edge of the continental shelf was thus 

 deeply drowned. This Inter submergence it was which 

 perph-xed the curly observers as to the nature of the origin 

 of the Continental Shelf. 



Cause and nature of movements— It has been pointed 

 <»ut already that the movement, although one of flexing, 

 was not of such a nature as to compress the reck structures 

 with the formation of mountain ranges, but rather that it 

 was of the nature of a very gentle warp broken by faults 

 which produced the effect of vertical uplift when viewed 



which the motion may be explained. 



in agreement with Professors Haddon, Hollas and Cole who' 2 

 " distinctly see in Australia and its islands "....*' the 

 vast folds of the earth's crust roll slowly inwards upon the 

 central continental mass." 



This view as stated appears to involve certain dynamical 

 difficulties. For example, if a thrust from the Pacific be 

 considered as rolling directly against the continental mass 

 above ocean base, then one would expect the fold curves 

 to be concave to the Pacific. On the contrary they are 

 convex. On the other hand if one imagines the periphery 



1 Hedley. C. (d) pp. 17 - 19. 



9 Trans. Koy. Irish Academy, xxx, 1VJ4, p. 473, Quoted from Hedley 



