U. S. GEOLOGICAL SURVEY 



PROFESSIONAL PAPER 91 PLATE VI 



.1. FOSSILIFEROUS LAMINATED CLAY OF THE UPPER 

 (GRENADA! FORMATION OF THE WILCOX GROUP 

 AT GRENADA, MISS. 



Jl. SANDS OF WILCOX AGE IN THE LAGRANGE FORMATION AT 

 LA GRANGE, TENN. 



