The Paso del Sapo Formation is a Maastrichtian geologic formation of the Cañadón Asfalto Basin in Argentina. The siltstones of the formation were deposited in a lacustrine environment. Plesiosaur remains are among the fossils that have been recovered from its strata.
Fossil content
Aristonectes parvidensCañadón del Loro at Fossilworks.org Ptychoceratodus sp. Flora
See also Plesiosaur stratigraphic distribution
References