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The Tertiary formations of the Canal Zone and adjoining parts of Panama range in age from late Eocene to late Miocene, or possibly early Pliocene. New formation and member names--Gatuncillo formation, Quebrancha limestone member of Caimito formation, La Boca formation, and Pedro Miguel agglomerate--proposed in official Panama Canal reports are defined.
Fossils from Vamos Vamos, a submerged locality in the Gatun Lake area, are considered early Oligocene in age. The fossiliferous strata at that locality are inferred to represent a marine tongue in the essentially non-marine Bohio formation.
The late Eocene Gatuncillo formation is strongly transgressive; the middle and late(?) Miocene Gatun formation is also transgressive; the late Oligocene(?) and early Miocene Culebra formation and the late Miocene or early Pliocene(?) Chagres sandstone represent minor overlaps.
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