Bulletin No. 255 



i B, Descriptive Geology, 6: 



DEPART.AIENT OF THE INTERIOR 



UNITED STATES GEOLOGICAL SURVEY 



CHARLES 1). WALCOTT, Dikectok 



THE 



FLUOESPAK DEPOSITS 



OF 



SOUTHERN ILLINOIS 



BY 



H. FOSTER BAIIsT 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1 9 (> 5 



m 



