Seiyentine Area and Rliyolites. 251 



plovations, made several excursions to examine the small but in- 

 teresting mountain lake, now known as Tali Karng, situated in 

 an inaccessible mountain valley on the western flanks of Mt. 

 Wellinaton. The lake was accidentally discovered in 1H88 by a 

 the lake in an account published in the Mining Department's 

 stcc-knian named Snciwden, but the first authentic information 

 was due to Howitt. who discussed the question of the origin of 

 Reports. 1891.' The lake is due to a huge barrier, but Howitt 

 was not able to satisfy himself as to whether the feature was to 

 be attributed to a landslip or to a moraine. The ice oriirin, 

 however, was the view most favoured. 



No geological features of this district were described, but 

 Snowy Bluff, in the Wonnangatta valley, and to the north of 

 Wellington, was carefuly examined by both Murray and Howitt, 

 who showed the importance and interest of the sections exposed 

 on the slopes of this mountain. This area is better approached 

 from the Wonnangatta side than from the Macallister valley. 

 It was the interest attached to the origin of the lake which 

 first attracted the present writer to the Wellington region. 

 The first visit was made in Januar}- of 1905^ and observatiims 

 on the origin of the lake were published in the Victorian 

 Naturalist of the same yeai\- The landslip origin of the lake 

 is there upheld. During the tour, however, graptolite slates 

 were noted on the Wellington river, and the fossils collected 

 were reported on by Dr. T. S. Hall." who showed . that they 

 repi'esented the upper ordovician series, and the existence of a 

 great inliei* of lower palaeozoic rocks was thus established. 



The serpentine and chromite mentioned by Murray were also 

 found to occur close at hand, in the slate area. An interesting 

 conglomerate, composed mainly of serpentine boulders in a 

 matrix of the same kind, was found along the margin of the 

 serpentine. 



The peculiarities of this occurrence were briefly described 

 bv the writer, in a previous publication of this society.^ The 



1 Dr. A. W. Howitt. Notes on Lake Kariig, Rep. .Mining Department Vic , Sept. 1891 p. 28. 



2 E. O. Thiele. A Trip to Lake Karng and Mt. Wellington, N. Gip]i>>land ; Victorian 

 Naturalist, vol. xxii., 1905, p. 22. 



3 T. S. Hall, M.A., D.Sc. Victorian Oraptolites, part iii. Kroni near .Mt. Wellington ; 

 Proc. Roy. Soc. Victoria, n.s., vol. xviii., part i., 190.5. 



4 E. O. Thiele. On a Palaeozoic Serpentine Conglomerate, N. (iipj'Slund ; Proc. Roy. 

 Soc. Victoria, n.s., vol. xviii., part i., 1905. 



