90 The Sedimentary, Metamorphic, 



seems to me, in the line of strike of this one. To the south- 

 ward, also, there is another dyke of the same kind close to the 

 Omeo-road. These three occurrences, I suspect, are either 

 of one and the same dyke or of separate dykes in the same 

 strike. 



The dyke-stone is greenish-grey in colour, with a compact 

 ground-mass with porphyritic long-bladed crystals of horn- 

 blende, which are now much chloritised. In places there 

 are also hexagonal crystals of chlorite after magnesia- mica. 



Under the microscope this rock has a ground-mass con- 

 taining a little yellowish- coloured basis, but the greater part 

 is a micro-crystalline aggregate of felspar and quartz in 

 grains. Throughout this ground-mass there is a good deal of 

 chlorite in minute flakes and fibres. The ground-mass con- 

 tains — (a) Rather large rectangular crystals of titanic iron, 

 which all show more or less alteration to Leucoxen. Some 

 of these crystals are what I can only describe as skeleton 

 crystals, having partly-formed bounding planes, including 

 ground-mass. (2) Eroded quartz crystals, which include 

 magma. (3) Long-bladed, light-coloured crystals of am- 

 phibol, with broken terminations. They are pleochroic in 

 shades of green. Intergrown with this amphibol, but on 

 only a small scale, is a fibrous rhombic pyroxene, which is 

 dichroic in shades of brown. 



The alteration of the amphibol is to chlorite. The felspars 

 are altered to a great extent to granular materials, which, 

 together with flakes of viridite, make up most of their sub- 

 stance ; but traces remain of their former structure, which 

 show that they were triclinic. This rock is therefore a 

 variety of quartz-diorite. 



I now return to the junction of Watts Creek and the 

 Little River, in order to complete the description of the rocks 

 seen in tracing up the former stream in the line of the 

 general section. 



From the junction of Watts Creek to the spot marked 26 

 there are continuous outcrops of schistose and igneous rocks, 

 intermixed more or less. The latter are mostly as veins, 

 with the characters of aplite. At 26 there is a mass of 

 schists with numerous foliations of quartz and small masses 

 or irregular veins of mixed felspar and quartz, up to 6 inches 

 in width. The schists resemble those which I have 

 mentioned, and described at 1, but are more altered. 



At 27 occurs another patch of much-contorted and winding 

 vertical schists, but having perhaps an average strike to N. 



