and Igneous Bocks of Ensay. 73 



About half-way between the junction of the Little Biver 

 and Tambo and the crossing of the Omeo-road over the 

 former there is a massive, rather light-coloured rock in the 

 bed and on the banks of the stream. It is composed of 

 felspars, quartz, some chlorite and apatite. The chlorite is 

 probably derived from hornblende, for I observed a portion 

 of that mineral in one case still intact. The chlorite is of 

 the character usual in the massive rocks of this district, 

 markedly dichroic in shades of green, and apparently filling 

 the place of some other mineral (hornblende) of the first 

 consolidation. In this chlorite there is always more or less 

 epidote, but not those minute black needles or minute 

 rods of iron ore which here almost always accompany the 

 chloritisation of iron magnesia-mica. 



The felspars are very much altered, being filled with flakes 

 of mica and plates of chlorite, but enough remains of them 

 intact to show that they were triclinia The quartz is very 

 plentiful in rather small grains, either singly or in inter- 

 locking groups. The apatite is in unusually stout crystals, 

 some of which have been broken across. 



Part of this rock has a micro-crystalline appearance, and 

 I found it to be largely composed of colourless epidote 

 granules and quartz, with traces of chlorite. The mass 

 included a few triclinic felspars. This micro-crystalline 

 portion of the rock resembles epidosite, and is analogous to 

 the numerous similar veins which are to be seen in the rocks 

 at Ensay. 



The main rock is a much altered quartz diorite, of a 

 slightly different type to the massive intrusive rock of the 

 district. It has less quartz, and was, I think, compounded 

 with hornblende, and not with mica. 



My description now brings me to those rocks which I 

 have separated from the sediments; that is to say, to the 

 metamorphic schists of Ensay. It might be said that some 

 examples which I have just described as belonging to the 

 sedimentary group should be placed among the schists — as, 

 for instance, the phyllites of Contentment Hill. Certainly 

 those rocks are so metamorphosed that their argillaceous 

 components are converted into mica ; but, on the other hand, 

 they have not lost their microscopic structure to any great 

 extent. They are but one or two stages in advance of the 

 sediments on the western side of the Tambo, and it has 

 seemed to me best to draw the line there, and to count all 

 the formations which are more schistose with the metamor- 



