MONOGRAPH XXXVI PL. VI 





Mansfield E " 



Sketch showing localion of secUo 

 General Map 



/^, Au 



^jr 



Air ^P Air 





„_, ^± "^ ' 



AKCHEAN 



GENER\L1ZED SECTIONS THROUGH ^^^''^'''^''J^ART OF CRYSTAL FALLS DISTRICT 



HORIZONTAL SCALE, 1 INCH = 1MILE- ^'^"^ ^^^LE, 1 INCH- 1320 FEET. 



ELEVATION OF^„;;X^« 000 PEET. 



the s"" ^"Posure h 



NOTE: Formations are brought to ^i)yiI/\V '■'*^ ^'^^'^ observed 



A'L' 



LOWER HURONIAN 



C.r.,uie SUirgeonandAiibik KouTS^^^^vnie M^^^d Her!;!^^''"' ^'SaJon''"""" ^SL 



PLEISTOCENE 



UNDIVIDED 



quavlziie 



dolomite Siamo slate 



Gabbro 



