and Igneous Rocks of Ensay. 105 



addition to the other two forms. These felspars have 

 brilliant chromatic polarisation, and the appearance, physic- 

 ally and optically, of the basic Labradorites and the Anorthite 

 felspars which I have observed in similar rocks at the 

 Sheep Station Creek Gap, in the Swift's Creek district. 



I could obtain but few obscuration measurements, but 

 those confirmed the general conclusion, being, in the 



zone OP — cc P cc ; 24° to 31°, and in three sections 



approximately near ccPa, 30°, 33°, 37°. A slice digested 

 in hydrochloric acid showed this felspar to be much attacked, 

 but not completely destroyed. 



The quartz is in large amount as an original residuary 

 constituent filling spaces in the manner usually seen in the 

 quartz diorites, to which group I assign this rock. 



About three miles from the Ensay ford there is a small 

 outcrop of schists, which is an unusual occurrence in the 

 upper part of Watts Creek. I collected two samples. 

 One is finely foliated and dark in colour, with rarely 

 small orthoclase crystals forming bulges in the folia- 

 tions, which are rather fibrous in places, and show 

 also plates of dark-brown mica and scales of talc. 

 Examined in thin slices, this rock proves to be composed 

 almost wholly of pinite material, together with numerous 

 flakes of brown magnesia iron-mica. With polarised light 

 the slices have much resemblance to serpentine. This rock, 

 therefore, is a variety of pinite schist. The second sample 

 is foliated, lighter in colour and showing small grains of 

 quartz and felspars in the foliations. It is composed, accord- 

 ing to microscopic examination, of much pinite, which is partly 

 the result of the alteration of orthoclase, the remains of 

 which can be plainly seen in some of the masses. The mica 

 is more or less converted into a pale slightly dichroic 

 chlorite. The quartz is in foliations, separating the other- 

 constituents. This rock is therefore a variety of those quart- 

 zose schists which I have before described; and here again it 

 is seen that there are two varieties of these schists analogous 

 to the quartzose and argillaceous sediments. 



The line of section crosses the high range at the sources of 

 Watts Creek, where the Ensay and Gellingall track descends 

 from it to a small stream before ascending the dividing ridge 

 which falls toward the Wilkinson River. The granitic rocks 

 continue from the sources of Watts Creek to this stream, 

 where as I have already said, at p. 71, there are traces of 



