PRE-CAMBRIAN LITERATURE OF NORTH AMERICA 751 



Laurentian Biotite granite gneiss, hornblende gneiss, amphibolite, grano- 



diorite, etc. 



Grenville ? 



(Lac La Ronge Quartz diorites, pyroxenites, amphibolites, gneisses, and 

 series) schists, and crystaUine Umestones 



Keewatin Chloritic and hornblende schists, diorites, hornblendites, ser- 



pentines, etc. 



Igneous Granites, pegmatites, diorite, dikes, younger than Laurentian 



The pre-Cambrian'' rocks east of the south end of Lake Winnipeg 

 are provisionally classified as: 



Post Lower Huronian Manigolagan granite. Pegmatite and gneiss 

 Huronian Wanigow series; conglomerate containing quartz, 



rhyolite granite, felsite, greenstone, jasper, and 



chert, maximum diameter of pebbles i foot 

 Keewatin Arkose, graywacke, chert, jasper, gray gneiss, and 



schist 

 Rice Lake series; greenstone, quartz porphyry, 



rhyobite, trachyte felsite, green and gray schist 



' E. S. Moore, "Region East of the South End of Lake Winnipeg (Manitoba),'* 

 Canada Geol. Surv. Siimm. Rept. igi2 (1914), pp. 262-70, map. 



{To be continued^ 



