ILLUSTRATIONS. 



Page. 



Plate I. Preliminary geological map of the Northwest xx. 



II. Geueral geological map of the Peuokee district 2 



III. Reprodiictiou of Whittlesey's cross section of Penokee range 18 



IV. Repniductidn of Whittlesey's geolofjical map of the Penokee range 20 



V. Detailed geology, Sheet 1 128 



VI. Detailed geology, Sheet 2 130 



VII. Topography, Sheet 3 132 



VIII. Detailed geohigy. Sheets 134 



IX. Topography, Sheet 4 136 



X. Detailed geology. Sheet 4 138 



XI. Topography, Sheet 5 140 



XII. Detailed geology. Sheet 5 142 



XIII. DetaUed geology, Sheet 6 144 



XIV. Thin sections from the Sontheru Complex 476 



Fig. 1. Biotite-granite. 

 Fig. 2. Biotitic granitoid gneiss. 

 Fig. 3. Hornblende-schist. 

 Fig. 4. Horublende-scliist. 



XV. Thin sections from the Southern Complex 478 



Fig. 1. Hornblende-granite. 

 Fig. 2. Horiiblende-biotite-syenite. 

 Fig. 3. Biotite-gueiss. 

 Fig. 4. Hornblende-gneiss. 



XVI. Thin sections from the Cherty limestone member - 480 



Fig. 1. Tremolitic dolomite. 

 Fig. 2. Cherty limestone. 

 Fig. 3. Concretionary chert. 

 Fig. 4. Chert. 



XVII. Thin sections from the base of the (Quartz-slate member 482 



Fig. 1. Chert containing fragnieiitul quartz. 



Fig. 2. Quartzose chert. 



Fig. 3. Chert-conglomerate. 



Fig. 4. Green schist anil conglomerjite. 



XVIII. Thin sections from the Quartz-slate member ... 484 



Fig. 1. Graywacke-slate. 



Fig. 2. The same, in polarized light. 



Fig. 3. Cherty slate. 



Fig. 4. Sericitic and chloritic slate. 



IX 



