318 REPORTS OF RESEARCH COMMITTEES. 



Ill several pa]>ers the varying influence of the newer basalt flows 

 on present-day streams, &c., has been dealt with, particularly in 

 papers No. 11, 12, 13, and 16, and the pre-basaltic river systems 

 to the east (12) and west (13) of Melbourne have been in part re- 

 constructed. Mention should also be made of references to 

 physiographic features in papers by Teale (Mt. Wellington and 

 Nowa Nowa), Cook (Coburg), Junner (Diamond Creek), Morris 

 (Lilydale), and in various papers by Prof essor Griffith Taylor, listed 

 elsewheire in this report. In the Annual Report of the Geological 

 Survey of Victoria, 1915, a plan of the Ararat Deep Leads is pub- 

 lished, showing surface and bed-rock levels, thus revealing a buried 

 topography. Another matter of much interest to physiographic 

 workers is -the publication of an excellent series of contour-maps 

 by the Commonwealth Military Survey, embracing the whole of 

 the area siirrounding Pert Phillip and Western Port, and extend- 

 ing to the country westward of Ballan. 



C.^ — Physiography in Queensland and Northern Territory. 



{By ■'Pro feemn* Hj - G m -Ri ehards, D.Sc, and H. I. Jensen, D.Sc). 

 Northern Territory. 



H. I. Jensen describes the Northern Territory (1) as a pene- 

 plain elevated in the Cainozoic period. Elevation commenced 

 after the deposition of the Cretaceo-Eocene lielemnite-bearing beds. 

 He considers that jt has been a slow movement, and that it ]:ersists 

 even to the present day except in the extreme north-east corner 

 of the Territory, the English Company Islands, and the Carpen- 

 taria ccast from Cape Wilberforce toi Cape Gray. He states also 

 that (2) the Northern Territory has undergone no compressional 

 earth-movements since the early Palseozoic period. Even Cam- 

 brian rocks are but slightly folded. Movements have been O'f the 

 vertical, isostatic type. Late Palseozoic (Permoi-Carboniferous) 

 and Mesozoic rocks have been laid down during periods of marine 

 transgression. (3) Evidences of Cainozoic uplift are cbtained in 

 the form of raised beaches on the west coast, in Tertiary beds and 

 raised beaches on the north coast, and in raised beaches and in 

 the advance of oak {Casuarina species) over the mangroves 

 (Rhizojihura species) on the Gulf of Carpentaria coast south of 

 Blue Mud Bay. 



Evidence of uplift can also be got in the nature of the river 

 channels. The rivers are cutting down and in many places show 

 distinct terraces. In places great canons have been cut, as in the 

 case of the Upper Katherine, and in the McArthur river between 

 Borrolocla and McArthur Station. The principal rivers prior to 



