Alamosaurus
Alamosaurus (; meaning "Ojo Alamo lizard") is a genus of titanosaurian sauropod dinosaurs, containing a single known species, Alamosaurus sanjuanensis, from the late Cretaceous Period of what is now southern North America. Isolated vertebrae and limb bones indicate that it reached sizes comparable to "Argentinosaurus" and "Puertasaurus", which would make it the largest dinosaur known from North America. Its fossils have been recovered from a variety of rock formations spanning the Maastrichtian age of the late Cretaceous period. Specimens of a juvenile "Alamosaurus sanjuanensis" have been recovered from only a few meters below the Cretaceous-Paleogene boundary in Texas, making it among the last surviving non-avian dinosaur species.
Plaza Huincul
The Argentinosaurus is the largest dinosaur to walk on earth and it was discovered in Plaza Huincul by Guillermo Heredia. It is estimated that it lived on Earth 94-97 million years ago. The Argentinosaurus has a height of 35 meters and Paleontologists have estimated that it may have weighed as much as 75 to 100 tonnes. The Argentinosaurus was discovered in 1987 by a rancher who mistook the legbone of a dinosaurs for petrified wood