PHYSIOGRAPHY OF THE SOUTHERN TABLELAND OF N.S.W. 347 



Those marked with an asterisk are composed of acid 

 igneous rocks; the rocks present on the others are unknown 

 to the writer. Table-top mountain has a capping of 200 

 feet or more of basalt and may possibly be a residual of the 

 Mount Ainslie peneplain. These monadnocks obviously 

 must represent residuals of an old erosion level — the oldest 

 in this part of Australia. With one exception, (Bimbery 

 Peak) the highest are from 1,300 to 1,400 feet higher than 

 the younger peneplain on which they stand, and this may 

 therefore be taken as the approximate height of the Barren 

 Jack plain above the Monaro peneplain. 



3. The Mount Ainslie Peneplain (?) — On the Yass-Oan- 

 berra tableland, of those residuals whose altitudes are 

 available to the writer, three only are 1,000 feet higher 

 than the Monaro peneplain. The highest of the remainder 

 except Spring Trigonometrical Station, range between 700 

 and 800 feet ; this exception may be a denuded residual of 

 the Barren Jack plain. In the district surrounding Bredbo 

 on the Murrumbidgee Senkungsfeld, residuals are very 

 numerous, most of which reach a maximum altitude of 

 about 700 feet above the Monaro peneplain. On the 

 Berridale and Adaminaby tablelands no residuals are known 

 to the writer exceeding 800 feet in altitude above the 

 Monaro peneplain. On the Yarrangobilly tableland but 

 one is known exceeding a similar altitude, viz., Lampie, 

 included in above list as a residual of the Barren Jack plain. 

 On the Kiandra tableland so many residuals ranging from 

 400 up to 1,464 feet higher than the Monaro peneplain 

 occur, that no safe inferences can be drawn; many of them, 

 however, range from 700 to 800 feet. 



Taking such evidence as is available, it would seem, 

 therefore, a fair assumption that a peneplain 700 to 800 

 feet higher than the Monaro peneplain and quite distinct 

 from the Barren Jack plain occurs. 



