$4 The Sedimentary, Metamorphic, 



The analysis shows a marked resemblance to that of the 

 pinite given at p. 85; and perhaps this much may be ven- 

 tured upon, that the main part of the rock is composed of 

 pinite. In this view, I have applied the name Pinite-schist 

 to it. 



From here the rocks seen in following up Watts Creek 

 are less schistose, and more crystalline-granular. Of the 

 former, some are so massive that it is only when looking at 

 them in situ that their schistose character becomes evident, 

 the hand specimens seeming to be crystalline-granular 

 or porphyritic. Some schists have the structure of 

 e: Augengneiss." 



I collected samples of the typical rocks which I observed 

 at the place indicated, as before, in the map by numbers, up 

 to the place at which undoubted invasive rocks appear — that 

 is to say, where it is possible to place the contact boundary 

 of the Ensay schists. 



30. — There is here a mass of pale, flesh-coloured crystalline- 

 granular rock, composed of reddish felspar and quartz, with 

 very rare plates of alkali-mica. Under the microscope I 

 determined it to have the following composition: — (a) 

 Felspars. The most prominent felspar is orthoclase in 

 much- wasted and eroded crystals, which obscured succes- 

 sively in different parts after the manner of the potassa fel- 

 spars of some pegmatites. The second felspar is triclinic 

 in crystals, compounded according to the Albite law. These 

 are also very cavernous. The angles of obscuration which 



I could measure in the zone OP — coPoo were low, being 

 between 1° and 14°, and in a section approximately 



near oo Poo 19° 30'. Tbis felspar seems, from these 

 observations, to be oligoclase. 



There is a very little chlorite and a few flakes of alkali- 

 mica, and the remainder of the rock is made up of quartz 

 granules. 



This rock is an aplite, and, according to its appearance in 

 situ, would have been formerly described as Eurite. 



I also examined a similar rock near at hand. Ifc resembled 

 the one just described, with this exception, that it contained 

 a rather larger amount of chlorite after mica, and that some 

 of the felspars were pinitised. 



In both examples the felspars, as also the residual quartz, 

 contained small quartz grains. 



