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La Colonia Formation
The La Colonia Formation is a geological formation in Argentina whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation.〔Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, South America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 600-604. ISBN 0-520-24209-2.〕
Originally thought to be Campanian in age or earlier, studies of underlying formations have made a Maastrichtian (70–66 million years ago) age more likely.
==Flora==
The paleoflora was known for its aquatic components, ''Paleoazolla'' and ''Regnellidium''.〔 However, recent paleobotanical discoveries at the Cañadón del Irupé locality have revealed the presence of a more diverse range of plants associated with these water bodies, including pteridophytes, gymnosperms, and various angiosperms.〔 Among these are fossil leaves and fruits assignable to Nelumbonaceae.
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