336 C. A. SUSSMILCH. 



The pliysiograpliical features of this area may then be 

 summarised as follows: a tableland 2,000 feet high result- 

 ing from the elevation of a peneplain, on the surface of 

 which are broad shallow mature valleys and above which 

 rise residuals of one or more older peneplains. Intersect- 

 ing this tableland are the more or less youthful valleys of 

 the Murrumbidgee River and its tributaries. 



The Yass-Oanberra Tableland extends eastwards past 

 Goulburn, practically to the coast and swings round north- 

 wards to Moss Vale and Mittagong. Throughout this 

 extensive area it has a general altitude of about 2,000 

 feet. Followed westward it gradually decreases in altitude 

 until it merges into the western plains. To the north' lies 

 the central tableland of New South Wales, about 3,000 feet 

 high; to the south lies the Kiandra-Murrumbidgee tableland 

 4,000 to 4,800 feet in altitude, from which it is probably 

 separated by a series of faults as indicated in the section 

 from Kiandra to Bowning. This latter is purely a sugges- 

 tion however, based on the appearance of the intervening 

 country as seen from the Yass tableland, as the writer has 

 had no opportunity of traversing this part of the southern 

 tableland. On the eastern extension of the Yass-Canberra 

 tableland lies the Lake George Senkungsfeld described by 

 T. Griffith Taylor. 



E. The Fault Blocks.— The occurrence of two adjoining 

 areas whose topography has arrived at a similar stage of 

 development, but which stand at different altitudes can be 

 explained either as the result of warping or of faulting. 

 If the change in altitude, in passing from one area to the 

 other is abrupt, it is most probably due to faulting. It has 

 already been pointed out that the change in altitude 

 between the different sections of the southern tableland is 

 in nearly every case decidedly abrupt, and this, taken in 

 conjunction with the fact that the topography on the 



