ROCKS BETWEEN DAISY AND BABY LAKES. 325 



great pressure. It exhibits well-marked parallel structure, its component grains 

 being drawn out in one direction. The larger drawn out grains show uneven ex- 

 tinction, as do also the finer-grained ones lying between them. Penetrating this 

 quartzite were noticed many irregularly shaped intrusions of the coarse granitic 

 gneiss." 



Rocks between Daisy and Baby Lakes. — On the portage from Daisy lake 

 into Baby lake the rocks strike N. 49° E. and the dip varies from 50° to 

 70°, but most generally the latter. The beds run in long, sweeping 

 curves and are penetrated in places by intrusive gneissic material which 

 shows up well against the darker feldspathic slates and quartzites. The 

 Huronian rocks are much squeezed and altered. Immediately to the 

 south of this portage rises a high hill composed of flesh-red granitic 

 gneiss, the foliation being in general very distinct. Embedded in this 

 gneiss on the very summit of the hill are patches of a dark greenish-gray, 

 distinctly bedded, slaty rock, which have been clearly caught up in the 

 gneiss during its irruption, and which are distinctly referable to some of 

 the Huronian beds in the vicinity. A specimen illustrating the contact 

 between these two rocks showed the slaty rock partly adhering to and 

 )»artly embedded in the granitic gneiss. 



Microscopic Examination of Contact Rod-. — A thin section was examined 

 by Mr Ferrier. who says: 



" This section shows a contact between a coarse-grained granitic rock and a chlo- 

 ritic and epidotic schist. The granitic rock exhibits gneissic structure in the mass 

 and may be classed as a coarse-grained biotite gneiss in which chlorite now replaces 

 the original biotite. Intense cataclastic structure is shown, and a curious fact is 

 that the feldspar,as often observed* under similar circumstances, preserves its crys- 

 tal form fairly well, whilst the quartz is all twisted and broken. Wulfing has sug- 

 gested that this may be due to gliding planes [i Jerman gleit Aachen) in the feldspar, 

 allowing it to yield and be perhaps slightly changed in form but not broken, whilst 

 the unyielding quartz would be all broken to pieces. The schistose rock presents 

 no unusual features in its mineral constituents, but has, like the gneiss, been sub- 

 jected to great pressure. Epidote is very abundant and angular fragments of quartz 

 and feldspar occur scattered through a very fine-grained chloritic groundmass. The 

 rock is probably of clastic origin." 



A thin section obtained from about the center of the Largest mass was 

 also submitted to Mr Ferrier, who reports: 



"A line-grained amphibolite, consisting of chlorite, epidote, hornblende and a 

 colorless mineral in the groundmass, which is probably feldspar, although satis- 

 factory axial figures were not obtained. A little iron with titanite occurs in the 



section." 



Rocks between Baby and Alice Lakes. — On the portage from baby lake 

 into Alice lake there is an apparent transition. The gneiss to the south 



