J. 8. GEOLOGICAL SURVEY 
BULLETIN NO. 164 PI 
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A. CRETACEOUS-EOCENE CONTACT ON THE FRIO RIVER, 2 MILES BELOW 
ENGELMANN'S RANCH SOUTHERN UVALDE COUNTY. 
The sandstone floor at the base of tne bluff is Cretaceous ; the middle and upper portions of the bluff ai 
Eocene. 
B BASAL EOCENE; PORTION OF SAME BLUFF, BUT FARTHER DOWNSTREAM 
