Compare dinosaurs
Pick two dinosaurs to see them side by side. Ranges are shown as published; missing values say Unknown.
- Period
- Jurassic· Kimmeridgian
- Age
- 154.8–143.1 Ma
- Diet
- Herbivore
- Length
- 21–23 m
- Height
- 3.3–4 m
- Mass
- 16.4–22.4 t
- Found in
- Morrison Formation, Colorado, Utah, Wyoming, United States
- Classification
- Dinosauria › Saurischia › Sauropodomorpha › Sauropoda › Diplodocoidea › Diplodocidae › Apatosaurinae › Apatosaurus › Apatosaurus ajax
- Year described
- 1877
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