The number of vertebrate remains at Las Águilas is unique for Central America.
Dinosaur taxa contain Hadrosauridae, Theropoda, Pterosauria, Plesio- and Mosasauria.
Dinosaurs occur in at least 9 different levels of a 50 m thick deltaic succession.
Marine, brackish and freshwater fossils reflect cyclic facies oscillations.
Sr isotope ratios provide the first absolute age of 73 ± 1 Ma for the area.