Geological Survey of Michigan. 



Annual Report for 1908. 



FIG. 8. NATURAL ROCK CLEARING OR OPENING (I, 2) NORTH OF THE LIGHT- 

 HOUSE AT ROCK HARBOR. 



FIG. 9. NATURAL ROCK CLEARING (I, 2) SOUTH OF THE LIGHT-HOUSE, ADJACENT 



TO FIG. 7. 



