Art. IV. — Geological Notes on the Gehi and Indi Rivers 

 and Monaro Gap, Mount Kosciusko, N.S.W. 



By A. E. Kitson. 



[Read 7th May, 1896.] 



The portion of New South Wales referred to in this paper is 

 comparatively little known, and therefore it may be advisable to 

 make a few remarks on its topography before entering upon its 

 geological features. By reference to the map submitted, which 

 with certain alterations and additions is a copy of that published 

 in 1881 by the Department of Lands and Survey of this Colony, 

 it will be noticed that opposite the Bringeinbrong homestead the 

 main stream receives a large tributary called the Little Murray, 

 Swamp or Gehi River. From here to its source it is known as 

 the Indi and on the east for some distance is flanked by the 

 Youngal Range which runs to Mount Kosciusko and forms the 

 divide between it and the Gehi; on the west by a range running 

 to Mount Pinnibar in Victoria. On the east of the Gehi are 

 many subsidiary spurs of the Dargal and Bogong Mountains, 

 from which among others come its affluents, the Swampy Plain, 

 Khancoban, Black and Gehi Creeks. Near its junction the river 

 flows through the rich grassy flats of the Bringeinbrong and 

 Khancoban Runs, but about ten miles higher up the valley 

 rapidly narrows and the stream is more or less confined between 

 steep gorges. The country between here and Groggin on the 

 Indi, some thirty miles away, is uninhabited, but huts at Black 

 Creek and Gehi River are used by drovers and travellers gene- 

 rally. Groggin has three inhabitants, the stockman of the run 

 and two selectors on the Victorian side. From here the Kosci- 

 usko track crosses the Snowy and Leatherbarrel Creeks and their 

 divides, which are spurs from the main peak, and branches off 

 north at Monaro Gap, six miles from Mount Kosciusko, at an 

 altitude of 5900 feet. 



On the geological map of New South "Wales, published in 1893, 

 most of the country bordering on the Gehi and Indi Rivers is 

 coloured as Silurian with a little granite some distance to the 



