THE KITCUI SCHISTS. 165 



The larger feldspar ])ieces in tlie grouiulinass lutve l)een n^ferred to as 

 crystals and fragments of crystals. In most cases tliey are nnquestionably 

 fragments. In many instances the pieces lying close together are dissevered 

 portions of the same crystal, fractured across at right angles to the planes 

 of schistosity in the rock. Tlie fragments thus formed have heen moved 

 apart in the planes of foliation. The fracturing and the movements of the 

 fragments are l)elleved to be an effect of mashing, which is shown also in 

 the rock's foliation. Man}- fragments are ragged in outline. TheA' do not 



L^rains in noncon'rlonieratic band of Kitrbi sdiist. 



correspond with other fragments in their vicinit>', nor lune theA- tlie straiglit- 

 edged ccmtours of the fractured crystals. These are like the fragments in 

 modem tuffs. They are in all probability pieces of crystals blown from 

 volcanic vents (fig. o). 



The chlorite in the groundmass is in small i)risms and needles, airanged 

 usually in approximately parallel directions, forming narrow bands, which 

 may be lamina?, in some places and in others may expand into comparatively 

 large lenticular masses. Chlorite occurs also in oval and irregular areas, 



