XII ILLUSTRATIONS. 



Page. 



Pi.ATK XXXVI. Detailed geology in the viciuity nf Peiiokee gaji ■_ 520 



XXXVII. Geological map of Giiiifliiit lake au<l vicinity, Animikie scries 522 



Fig. 1. Keiirodiictiou of Barnes and Wliitney's geological niaji of region lietween Agogebic 



lake and Montreal river 13 



'2. iieprodiiction of a portion of Brooks and Piiuipelly's geological niai) of the upper 



peninsula of Michigan HI 



3. Schist cut by massive granite, NW. i Sec. 4, T. 46N., R. 2 E., Wisconsin ; 117 



4. Schist cut by granite, NE. corner Sec. 28, T. 47 N., R. 45 W., Michig.an 117 



5. Maji of exposures at Potato river 172 



t'l. .luMct ion (d' i|uartz-sl.ite and green .schists at Potato river 173 



7. Large-.scale drawing of junction of (|uartz-slate iiud green schists at Potato river .. . 174 



S. Maji and section showing position of rock exposures at Tyler's fork 177 



9. Mai> of exposures at West branch of Montreal river -■ 178 



10. Hornblende enlargement of angite in diabase - - 412 



11. Hornblende enlargeiuent of angite in diabase 413 



12. Basal conglomerate in contact with granite in Sec. 28, T. 47 N., R. 42 W., Michigan.. 450 



1 



