Scientists have finally solved a 100-year-old mystery about a dinosaur graveyard in Cleveland, Utah.
The Cleveland-Lloyd Dinosaur Quarry (CLDQ) was first discovered in the 1920s and excavations soon showed it was the densest deposit of Jurassic theropod dinosaurs ever found. They also showed the fossil bed had an unusually large proportion of Allosaurus fossils—a 28- feet-long predatory dinosaur that lived in North America 155 to 150 million years ago.
The question of how so many dinosaurs ended up in such a small area has baffled scientists ever since.

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