During the Early Cretaceous period, approximately 125 million years ago, a very bizarre sauropod dinosaur inhabited what is now northern Patagonia.
Amargasaurus cazaui was a 9-metre-long sauropod with unusually elongated neural spines projecting upwards from its neck vertebrae.
Facts
| Period | Cretaceous |
| Age | 125 million years old |
| Diet | Herbivore |
| Height | 2 metres at the hips |
| Length | 9 metres |
| Weight | roughly 2.5 tonnes |
| Discovered at | La Amarga Formation, Neuquén (1991) |
| Discovered by | Leonardo Salgado et al |