114 Transactions. 
the Snow Mountains only, though the structure of the whole of New 
i ess and Kober may approximate thereto 
valley of the Waiponga Stream draining westwards into Geelvinck Bay, and 
thence eastwards by the Rouffaer and Idenburg Rivers, which unite and 
enter the sea by way of the Mamberamo River, traversing the Van Rees. 
ange. These two rivers have a flood-plain up to twenty miles in width 
Guinea, a portion of the Australian massif. Heldring (1909) suggested 
that this formed with the Arafura Sea and Gulf of Carpentaria an 
elliptical area of depression, the Gulf of Papua being a similar but more 
pronounced feature, and pointed to several features as evidence of such 
movements of depression, faulting, or warping; and David (1914) has 
entertained a similar view. Verbeek (fide Brouwer, 1917) doubted the 
validity of this evidence. 
