Geological Notes, Mount Kosciusko, X.N. IT. 25 



Between the last-mentioned spur and the southern ridge there 

 is a deposit of alluvium, twenty-live feet deep, showing the 

 remains of old river terraces. The southern ridge is granite, some 

 of it consisting of light-pink orthoclase, and pearly muscovite 

 in about equal proportions with milky quartz, other portions 

 of an exceedingly fine-grained, red, gneissose variety mainly 

 composed of mica, highly decomposed and having a foliated 

 appearance much like that of a mica schist. 



. From the end of this ridge the river valley bears straight 

 towards Mount Kosciusko, through extremely rugged country 

 hitherto found impracticable for horses and the track trends 

 southwards to the Indi Valley. On leaving the river it follows 

 the course of a large creek for some distance. In the gravels on 

 the flat are several prospecting shafts from three to five feet deep. 

 Between here and Scrubby Creek lies a low, granite spur of the 

 Youngal Range whose highest point is some 2300 feet. The 

 granite is a fine-grained muscovite variety of shades of grey, pink 

 and red, the former prevailing on the Gehi slope and the latter 

 on that into Scrubby Creek, where the rock decomposes into a 

 rich, red loam of considerable depth. Granite of the same 

 character occurs on the opposite slope, beyond which it changes 

 to a greyish-white with little muscovite forming a poor soil. 

 This is the main Youngal Range and has here an altitude of 

 2700 feet. After getting into the valley of the Indi no outcrop 

 is visible till the river is reached. Between this point and 

 Groggin the rock in situ may be seen in the bed of the stream, 

 and also at the junction of Omeo Creek and again at Selk Creek, 

 where it forms a bar almost across the river. It is a pretty, grey 

 granite showing little decomposition, and is totally different from 

 any met with south of the Gehi. It is evidently an intrusive 

 one of more recent age, and comes in from the south through 

 Groggin. The bed of the river contains several kinds of schists, 

 slates, sandstones and granites. At Groggin the rock is of a 

 much darker colour owing to an increase in the quantity of 

 biotite. 



Here the track leaves the Indi Valley and bears off for the 

 Monaro Gap. As far as the Snowy Creek there is no appreciable 

 change in the rock, and the stream contains the same kinds of 



