334 C. A. SUSSMILCH. 



Altitude. 



The Berridale Tableland 3,100-3,200 feet 



The Adaminaby Tableland ... 4,000 



The Kosciusko Tableland 6,000 



The Yarrangobilly Tableland ... 4,000 



The Colinton Senkungsfeld ... 2,400-2,600 



The Jindabyne Senkungsfeld ... 3,000? 



The two last being relatively narrow and bounded by 

 much higher areas, cannot of course be called tablelands, 

 and the reasons for calling them Senkungsfelds will be 

 given later. As already stated, where these tablelands 

 adjoin, the change in altitude is in nearly every case abrupt, 

 markedly so in some cases. The details of the topography 

 on all of them is strikingly similar, except where it has 

 been modified by subsequent ice-action, as on the Kosciusko 

 tableland. 



The coastal portion of this area east of the main divide, 

 has not been visited and will not, therefore, be described 

 here. It will probably be found that here, as elsewhere in 

 New South Wales, the tableland has a general slope to the 

 coast and has been considerably dissected since the last 

 uplift. 



D. Description of the Yass-Canberra Tableland.— The 



topography of this area is so essentially similar to that of 

 the other parts of the southern tableland that it may be 

 taken as the general type. The surface 1,800 - 2,000 feet in 

 altitude consists of extensive gently undulating plains (see 

 Plate 11, fig. 1) traversed in all directions by broad, shallow 

 mature valleys 100 to 200 feet in depth. Rising above these 

 plains occur isolated hills, such as Bowning Hill (Plate 9) 

 and Mount Ainslie, also long narrow ridges such as the 

 Razorback between Goulburn and Gunning. The under- 

 lying rocks consist of highly inclined Silurian and 

 Devonian sedimentaries extensively intruded by granites 



