GEOLOGICAL SURVEY X6
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 7




















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4


 X4
3


8










 X2


 Ar

 4e
 4
 4p



 X2

9


14

 15


PROFESSIONAL PAPER 306 PLATE V'











 x 1

 5 64 x n1'


x 18 10


















16 X3 19 X1 2


13


18


LATE EOCENE OR EARLY OLIGOCENE MOLLUSKS FROM MARINE MEMBER OF 1OI0(?) FORMATION AND LATE
 OLIGOCENE MOLLUSKS FROM MIDDLE MEMBER OF CAIMITO FORMATION IN GATUN LAKE AREA