Allosaurus Vertebra - SOLD 6.030" Vertebra with StandWith its iconic skull "hornlets," Allosaurus struck a unique and intimidating figure when compared to other carnivorous dinosaurs. This bipedal predator lived during the Late Jurassic, over 145,000,000 years ago, and used its powerful bite to take down prey in packs. This specimen is a 6. 030" fossil vertebra piece from an Allosaurus recovered on private land from the Morrison Formation. It is estimated to be approximately 146 156 million years old.