PLATE IV. 



Figure 14 (page 36) represents in plan a "diorite" dike with a tongue extended 

 into the schist. Light-house Point, Marquette. 



Figure 15 (page 36) shows in plan the line of junction of a "diorite " with the 

 schist. Quarry near Light-house, Marquette. 



Figure 16 (pages 36, 38) shows in plan the relations of a felsite, represented on 

 the right of the figure by angular marks, to a later "diorite" dike and to the schist. 

 The " diorite " cuts and faults the felsite, but as the portion to the left of the " dio- 

 rite " is under the waters of the lake, the writer is not sure of the accuracy of that 

 portion of the figure. 



Figure 18 (page 41) shows in plan the line of junction between the "diorite" and 

 schist. East of Ishpeming. 



Figure 19 (page 41) shows in plan the line of contact between the "diorite " and 

 schist, with an enclosed fragment of schist in the "diorite." ISTortheast of the 

 Cleveland Mine, Ishpeming. 



Figure 20 (page 41) is a section, chiefly ideal, showing the supposed relations of 

 the " diorite " dike to the adjacent schist, at the same locality as Fig. 19. 



Figure 21 (page 41) represents in plan the line of junction between the "diorite" 

 and schist. Northeast of the Cleveland Mine, Ishpeming. 



