BY H. I. JENSEN. 845 



outlying parts which I have not visited (Plate xlvi.); and the 

 other a map of the Nandewar Mountains themselves which I 

 have personally investigated (Plate xlvii.). 



The former is intended to bring out the following features : — 



(a) The distinction between what is known as the Nandewar 

 Range and the Nandewar Mountains proper. The Nandewar 

 Range is an ofiPshoot of the Moonbi Ranges, and connects the New 

 England Mountains with the Nandewar Mountains proper. It 

 forms a watershed between the Horton and Manilla Rivers. The 

 Geological Survey Department's Map of New South Wales (com- 

 piled under the direction of Mr, Pittman, Government Geologist, 

 1893) shows that this range consists of Permo-Carboniferous 

 rocks and older rocks of Carboniferous and Devonian age, such as 

 serpentine, limestone, slate, &c., but where it merges into the 

 Nandewar Mountains proper (which might appropriately be 

 termed the Lindesay Group) these old rocks are capped with the 

 lavas of the Tertiary trachyte and basalt series. 



(b) The direction of flow of the rivers and creeks. 



(c) The mountainous nature of the country between the 

 Nandewar Mountains and New England. 



(d) The geological formations of the country from which, in 

 conjunction with the configuration, deductions may be drawn as 

 to its geological history. 



The second map shows the configuration and the geological 

 formations of the Lindesay Group, from which deductions will be 

 drawn in the section on (xeomorphogeny. 



The Nandewar Mountains as seen from afar (as from Narrabri 

 or from the Warrumbungle Mountains peaks) form a dome- 

 shaped mass. The highest point of the group is Mount Kaputar, 

 about 5,000 feet high, and the Lindesay Tableland surrounding 

 it is over 4,000 feet in average altitude, with many eminences on 

 it approaching 5,000 feet. The Nandewar Mountains (Lindesay 

 group) cover an elongated oval area, having its long axis running 

 N.N.W.-S.S.E. The highest peaks are situated on this axis, 

 from which spurs capped with smaller peaks run W.S.W. and 

 E.N.E. The spurs are separated by deep, narrow, gorge-like 



