FIELD COLUMBIAN MUSEUM 
PUBLICATION 36, 
GEOLOGICAL SERIES. Vou. I, No. 6. 

GON EREBUTIONS. FO 
fener LON TOLOGY OF THE 
Pane hr LACKOUS 
SERIES 
BY 
Wittiam Newton Locan, A.M. 

OLIVER CUMMINGS FarRINGTON, PH.D. 
Curator, Department of Geology. 

GHIGAGOIcU ao. A: 
April, 1899. 
