Plate XXXIV.— GEOLOGICAL MAP OF SOUTHEAST END OF REPUBLIC HORSESHOE. 



Fig. 1. Southeast corner of the horseshoe, showing the surface relations of the magnetite and hematite 

 to the jasper, quartzite, and soaproek. The larger ore deposits of magnetite are bottomed 

 by soaproek, making steeply pitching troughs. The specular ore is for the greater part of 

 the distance separated bj' a belt of soaproek from the magnetite ore and quartzite. 



Fig. 2. Map of the vicinity of Republic mine, showing the contact between the Lower Marquette 

 and Upper Marquette series and the quartzite tongue. It will be seen that the great ore 

 deposits occur in the two plunging synclines at the southeastern bend of the trough. 



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