322 A. E. BARLOW — LAURENTIAN AND HURONIAN ROCKS. 



Cleavage Planes and embedded Quartette. — Where the quartzites abui 

 on the gneiss on Wavy lake a set of cleavage planes is developed parallel 

 to the line of contact. At the eastern end of the lake, where the folia- 

 tion of the northern and southern areas of gneiss converge in a common 

 strike, angular fragments of various sizes of the Huronian micaceous 

 quartzites were noticed embedded in the gneiss, the foliation of the latter 

 Bowing around the irregular outline of these fragments. 



CHIEFS LAKE. 



The Contact. — From Wavy lake the line of demarkation curves around 

 very quickly from northwest to northeast, and was next ^t'en on the 

 north shore of Chiefs lake, on the south line of the township of Broder 

 (Salter's baseline), three ami a half miles east of Long lake. Throughoul 

 this distance of nearly six miles the general strike is northeast. 



The Rocks. — The late Mr Alexander Murray, who made an examination 

 of the rocks exposed on Salter's base line, simply describes the boundary 

 here as a junction between " red gneiss " and "greenish mica slate." 



BRODER TOWNSHIP. 



Direction and Extent of the Contact. — The line from this point strikes 

 due north into the township of Broder for about a mile, when it bends 

 around to the northeast for half a mile, and then to X. 78° E.. winch 

 general strike it maintains till the eastern line of Broder is readied- 

 Where this last abrupt change in the line of junction takes place the 

 Huronian rocks, with a strike of X. 75° E. and dip S. 15° E., abut on the 

 gneiss, whose lamination has a direction of N. 40° E. and dip S. 50° E. 

 <^68°. Throughout the remaining part of the township of Broder, how- 

 ever, the micaceous slates and quartzites have approximately the same 

 strike and dip as the gneiss. The gneiss is always superimposed on the 

 sedimentary strata and both rocks dip in a southerly direction at angles 

 varying from 65° to 70°. 



Microscopic Examination of Huronian Schist. — A specimen af the Hu- 

 ronian schist was obtained on tin 1 line between lots 4 and •">. concession 

 HI, three hundred and fifty yards north of the contact with the gneiss. 

 Dr Lawson says of this ; 



•'A gray, moderately fine-textured schist, spotted with scales of brown mica and 

 having uneven or lumpy cleavage surfaces with marked silvery l:1"ss. Under 

 the microscope the clastic character of the nick is apparent, it being composed of 

 grains of quartz and feldspar chiefly. Throughout this clastic aggregate there 

 have been developed numerous pluies of brown mica and some of muscovite, 

 nearly all in parallel position. Scattered thoughout theslideare nests of separated 

 or closely aggregated grains of a light-yellow pleochroic mineral, probably epidote. 



