Titanosaur

A cast of the world’s largest dinosaur, the titanosaur, found in Argentina, soon will cast its gaze over future visitors to the main hall of the Field museum.

But 70 million years ago, near modern-day Asturias in northern Spain, there existed a lagoon, and as the land sank, the sea flooded it at high tide, and the bones of alligators, pterosaurs and dwarf titanosaurs (long-necked sauropod dinosaurs) were buried in the sediment.