Bulletin of tke Museum of Comparative Zoology, 



AT HARVARD COLLEGE. 



Whole Skrtks, Vol. VII. 



(Geological Series, Vol. I.) 



No. I. 



NOTES ON THE GEOLOGY 



OF THE 



IRON AND COPPER DISTRICTS 



OF LAKE SUPERIOR. 



By M. E. WADSWORTH. 



CAMBRIDGE: 



PRINTED EG H THE M U SE UM. 



July, 1880. 



