66 The Sedimentary, Metamorphic, 



the banks of the river, or its bed. At a distance of about five 

 miles in a direct line from the Haunted Stream the hills on the 

 eastern side of the river suddenly become lower, their con- 

 tours smoother, and the vegetation changes favourably with 

 the change of formation. It is here that the Silurian sedi- 

 ments give place, on the eastern side, to intrusive and schis- 

 tose rocks. At this place I observed that the schists have 

 the character of phyllites, approaching to fine-grained silky 

 mica schist, and not that of hornfels, as at Noyang. They 

 resemble, therefore, the least metamorphosed examples of the 

 Omeo schists; and I may say that here is their margin, in 

 probably its most southern extension. The course of 

 the Tambo River from Swift's Creek junction to this 

 place is generally south: and it is to be observed that 

 on the western side there are high, rough, and barren 

 ranges of more or less metamorphosed Silurian rocks, 

 rising steeply at a little distance from the river, which, 

 however, flows over varieties of massive holocrystaliine 

 intrusive rocks of the quartz- diorite group. On the eastern 

 side of the river the country is much lower than on the 

 western side, and it is only at a distance of from seven to 

 eight miles that it again rises into high mountains, such as 

 Mt. Nukong or the northern peak of Mt. Elizabeth. This 

 wide extent includes the watersheds of several streams, of 

 which the Little River is the most considerable. Wherever 

 I have traced up the courses of these streams I have found, 

 with slight exceptions, as at the Little River and Watts 

 Creek at Ensay, that they are over massive intrusive rocks. 

 It is therefore to be noticed that in the stream-beds which 

 show the deepest sections there are only to be seen holo- 

 crystaliine rocks, while on the summits of some of the 

 ranges there are traces of schistose and sedimentary 

 formations. 



In this part of the Tambo Valley I again find broadly 

 those features to which I drew attention when speaking of 

 the physical geology of Noyang. The river divides the 

 regions of sedimentary from those of igneous rocks. Physical 

 features such as these are found in other parts of the district, 

 and are not confined to the Tambo River Valley. 



Section II. — Analytical Examination of the Rocks. 



In the area which I propose to describe in this paper there 

 are but few sedimentary rocks in the immediate vicinity of 



