The Gatuncillo Formation (Tgo)Geologic Map, 1980 is a geologic formation in central Panama. The formation is exposed in the Panama Canal Zone and surrounding areas. It preserves fossils dating back to the Middle to Late Eocene period.Gatuncillo Formation at Fossilworks.org
Description The Gatuncillo Formation is the oldest sedimentary unit of the Panama Canal Zone, unconformably resting on Cretaceous basement. The formation was defined as Gatuncillo Shale by Thompson in 1944, who named it after the Gatuncillo River. The estimated thickness ranges from .Woodring, 1957, p.13
Though the Gatuncillo consists chiefly of mudstone and siltstone, it includes bentonitic mudstone, sandstone, and limestone, and at the base a conglomerate of variable thickness.Woodring, 1957, p.14
Fossil content Zamia nelliaeErdei et al., 2018, p.186 Podocnemididae indet.Cadena et al., 2012, p.549
See also List of fossiliferous stratigraphic units in Panama
References
Bibliography