Mount Saint Peter
Around 1765 the skull of a "Mosasaurus" was discovered here in a limestone quarry, one of the first recognised reptile fossils, which was later acquired by the Teylers Museum in Haarlem. A more famous "Mosasaurus" fossil was found between 1770 and 1774 but was confiscated by the French in 1794 and is now in the Muséum national d'Histoire naturelle in Paris. Later dinosaur remains were discovered here as well, belonging to "Betasuchus" and "Orthomerus", as well as turtles and fossils of smaller creatures of the sea.
Marasuchus
Until 2003 "Marasuchus" was thought to be one of the closest relatives of the dinosaurs. At present it has been supplanted by other dinosauromorphs such as "Silesaurus". Nonetheless, "Marasuchus" remains an important animal for understanding the origin and evolution of dinosaur characteristics. The following is a 
cladogram of basal Dinosauriformes according to Nesbitt (2011), and Dinosauria according to Baron "et al." (2017):
Alfred Romer first discovered fossils of the species in the 1960s in the Chañares Formation of the Ischigualasto-Villa Unión Basin in northwestern Argentina, all parts of the reptile’s skeletal anatomy are known from fossils except for the skull and lower jaw. The formation was dated as being 235 to 234 million years old.