Dinosaur time gap

Did Allosaurus and Dimetrodon live at the same time?

No. Allosaurus (Late Jurassic) and Dimetrodon (Cisuralian) are separated by 120 million years.

Allosaurus to you: 143 million years.

Allosaurus

Late Jurassic · 155–143 million years ago

Named by Marsh, 1877

Fossils from United States, Portugal, France, 1 more

Silhouette by Will Toosey

Dimetrodon

Cisuralian · 283–274 million years ago

Named by Cope, 1878

Fossils from United States, Canada, Germany

Dimetrodon is not a dinosaur.

Silhouette by Will Toosey

Dig from Dimetrodon down to Allosaurus →

Between Dimetrodon and Allosaurus

  • Helicoprion Guadalupian · 274–267 million years ago
  • Kwanasaurus Late Triassic · 227–201 million years ago
  • Plateosaurus Late Triassic · 227–206 million years ago
  • Ichthyosaurus Early Jurassic · 201–200 million years ago
  • Megapnosaurus Early Jurassic · 201–193 million years ago
  • Lufengosaurus Early Jurassic · 200–193 million years ago
  • Yunnanosaurus Early Jurassic · 200–193 million years ago
  • Megalosaurus Middle Jurassic · 168–165 million years ago

Fun Facts

  • Allosaurus is known from 147 fossil sites.
  • Allosaurus spans 12 million years of rock.
  • Dimetrodon is known from 94 fossil sites.
  • Dimetrodon is not a dinosaur. It was gone 37 million years before the oldest dinosaur here.

Did they live at the same time?

Every animal you can pick →