NEWS: New Dino Ranks as Europe's Largest-Ever Predator
Based on sedimentary deposits at the site, the two dinosaurs were buried quickly after a river flooded and broke through its natural levee, which would have turned the ground into something like quicksand. The dinosaurs' rapid and deep burial, Lacovara said, accounts for the extraordinary level of fossil completeness.
"Its misfortune was our luck," he added.
Dread was a titanosaur, meaning a type of four-legged, plant-eating dinosaur from the Middle Jurassic to Late Cretaceous periods.
"Titanosaurs are a remarkable group of dinosaurs, with species ranging from the weight of a cow to the weight of a sperm whale or more," said paleontologist Matthew Lamanna, a curator at the Carnegie Museum of Natural History.
"But the biggest titanosaurs," Lamanna continued, "have remained a mystery because, in almost all cases, their fossils are very incomplete."
Another titanosaur, Argentinosaurus, could knock Dread off its top size spot in the dinosaur record books if more complete specimens for it are found.