BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



VOL. 1, PP. 357-394 



SOME RESULTS OF ARCHEAN STUDIES 



BY 



ALEXANDER WINCHELL, A. M., L.L. D., F. G. S. A. 



PROFESSOR OF GEOLOGY AND PALEONTOLOGY IN THE UNIVERSITY OF MICHIGAN 



WASHINGTON 



PUBLISHED BY THE SOCIETY 



April, 1890 



