38 c 



GEOLOGICAL SURVEY OF CANADA. 



Sefpentinfc 

 from Rein-deer 

 Lake. 



Huronian rocks 

 at east end of 

 Island. 



Relations of 

 Laurentian 

 and Huronian 



strata. 



Glacial strise. 



chromic oxide. As far as I am aware, this is the tirst locality at which 

 serpentine has been discovered in the Huronian rocks to the north- 

 west of Lake Superior. Its association with the great diorite dyke 

 cutting the gneiss along the Nelson Eiver above Split Lake was 

 described in my report for 1878. It was also referred to by Dr. Har- 

 rington in connection with his investigations of the mineralogical 

 relations of these two rocks. A tobacco-pipe, carved out of a tine 

 variety of serpentine, was presented to me by an Indian on the Nelson 

 Eiver, who said that the stone came from the great Eein-deer Lake, to 

 the north of the Churchill Eiver, into which it discharges in about 

 longitude 103°. At the eastern extremity of the main body of Island 

 Lake, the Huronian rocks are again met with in the form of light 

 bluish-gre}^ calcareous felsitic schist towards the north side, and ol 

 grey quartz-rock towards the south. A quartz vein in this vicinity 

 contained patches of yellow pearl-spar, but no indications of metallic 

 ore was found either here or in any other vein around Island Lake. 



The strike of the Laurentian gneiss in the neighborhood of the 

 Huronian rocks appears in most cases to correspond nearly with that 

 of the latter in the vicinity of Oxford and Island Lakes, but around 

 God's Lake both systems seem to be much disturbed, and it is difficult 

 to ascertain their relations to each other. From the table already 

 given, showing the strike of the gneiss in a considerable number of 

 localities throughout this region, it is evident there is no tendency to 

 a general uniformity of direction over any considerable extent of 

 country. 



The directions of the glacial strise in forty-four localities, at which 

 Mr. Cochrane noted them, are given, along with a list of those recorded 

 by myself in the other parts of the district. 



G-LACIAL STRI.3E. 



Having already referred to the superficial deposits and the glacial 

 phenomena generally, with the exception of the striae, in the course of 

 my description of the regions traversed, it only remains for me to give 

 the directions of these grooves, which, for the sake of brevity, I shall 

 state in tabular form. They are all referred to the magnetic meridian. 

 Distances are given in straight lines. 



Little Churchill River. 



1. Four miles below outlet of Was-kai-ow-a-ka Lake. ......... S. 30° W. 



2. Thirteen miles below " " S. 70° W. 



3. Eighteen miles below " " S. 85° W. 



4. Outlet of lower Recluse Lake, various directions from S. 5° W. 



to S. 40° W., also S. 80° W. 



