SOUTH WESTERN NOVA SCOTIA. POWERS. 301 



muscovite. When the mica, especially the muscovite, be- 

 comes more abundant, the rock has a slightly yellow tinge. 

 The feldspar and quartz both occur in small grains, the form- 

 er being white, and hence less conspicuous than the flakes of 

 mica. Under the microscope the rock is seen to consist prin- 

 cipally of xenomorphic crystals of feldspar and quartz, the 

 latter showing undulating extinctions due to shearing, biotite 

 in very numerous shreds and flakes between the other grains, 

 accessory muscovite in occasional shreds both inside and 

 outside the feldspars, and a few apatite crystals inside feld- 

 spars and muscovite crystals. The feldspar consists largely 

 of oligoclase, with some albite-oligoclase (Ab 9 Ani) and albite- 

 microcline microperthite. The results of a Rosiwal measure- 

 ment of the rock will be found below. One slide shows a 

 number of mermycitic intergrowths of the quartz and oligo- 

 clase feldspar. Some of the latter show zonal growths and 

 occasionally undulating extinctions. The muscovite appears 

 to be largely secondary, probably being developed by pneu- 

 matolytic action. In some cases it shows the same amount 

 of shearing as the remainder of the rock and is therefore 

 thought to be primary. 



The Harrington batholithic area contains two kinds of rock? 

 a pink aplitic granite at Barrington, and a biotite quartz 

 diorite elsewhere. The relation of these two rocks is not 

 known, only two exposures of the former being found, andTa 

 few of the latter. It is to be inferred from the relation of 

 similar rocks elsewhere, as shown by the quotation given 

 above, that the aplitic granite is the younger ; yet probably 

 intruded during the same diastrophic period. 



The aplitic granite outcrops an eighth of a mile northeast 

 of the Barrington railroad station. The same granite cuts 

 micaceous quartzite at the crossing of the railroad and the 

 road north from Villagedale. Between this outcrop and Vil- 

 lagedale, at Solid Rock and also for a mile south of Solid Rock, 

 micaceous quartzite is cut by numerous stringers of aplite, 



