AUSTRALASIA, NEW GUINEA, AND NEW ZEALAND 753 



the growth of Australia as from west to east. In 191 1 the same 

 writer amplified his earlier statement and said: 1 "Since the close of 

 Paleozoic time Australia has been subjected to broad warps, but not 

 to true folding except in the direction of New Guinea, where Cre- 

 taceous, and even early Tertiary, strata are highly folded. New 

 Guinea is thus a new fold region; and even in Australia tectonic 

 movements are newer as New Guinea is approached" (p. 59). 



H. I. Jensen 2 also, in a later note, discussed the gradual growth 

 of the eastern portion of the continent. 



Like David's earlier reports, this paper of Jensen's is important 

 and suggestive. Jensen approaches the problem of Eastern 

 Australian history also from the viewpoint of " petrological unity." 

 He, however, considered that the folding of the Permo- 

 Carboniferous sediments was sporadic and had died out practically 

 in Northern New South Wales. 



In 1 9 14 David 3 presented an epitome of Australasian geology. 

 In this he said: "The latest folding to which the earth's crust in 

 Australia has been subjected belongs to late Carboniferous time" 

 (p. 256). He qualified this, however, by the statement: "The 

 strata in the Permo-Carboniferous system are either perfectly 

 horizontal or disposed in broad open troughs and arches. Only in 

 the case of the strata of Drake and Undercliffe in New England 

 and the Ashford areas [New South Wales] and the Gympie area 

 in Queensland, are the strata of this system highly disturbed near 

 granite intrusions " (p. 267). 



The reader is referred for a consideration of this statement to 

 the discussion of the field evidence in connection with the Permo- 

 Carboniferous. It will then be seen how incomplete is our knowl- 

 edge of the ageof the sedimentsof Eastern Australia lying to thenorth 

 of Sydney, and hence how great the need for caution to be exercised 

 in coming to any definite conclusion as to the scheme of structure. 



X T. W. Edgeworth David, "Presidential Address," Proc. Roy. Soc. N.S. Wales, 

 i9ii,pp. 15-76. 



2 "The Building of Eastern Australia," Proc. Roy. Soc. Queensland, July, 1911, 

 pp. 149-98. 



3T. W. Edgeworth David, "The Geology of the Commonwealth" (Federal 

 Handbook), Brit. Assoc. Adv. Sci., Australian meeting, 1914, pp. 241-325. 



