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Camarasaurus (Cam-ah-rah-sore-us), Chambered Lizard, lived in the Late Jurassic of North America. It was the most common sauropod in North America. It shared the environment with Apatosaurus, Diplodocus, Stegosaurus and the main predator Allosaurus. It is know from 3 well documented species form the Morrison formation in North America. The initial occurrence is C. grandis. Later in the formation it coexists with C. lentus. Then C. grandis disappears and C. lentus continues. Both these animals are about the same size, 50 feet long with a range in individual animals. In the last of the Morrison many different dinosaurs seem to get bigger as the climate changes to arid. C. supremus gets about 50% larger making it the heaviest dinosaur in the Morrison and 75 feet long.

Content List

1. Genera & species

2. Characteristics

a. Size

b. Behavior

3. History of Discovery

4. Paleoenvironment

5. References

Genera and Species

Classification: Sauropoda, Macronaraia, Camarasauridae.

Species: C. supremus, C. grandis, C. lentus, C. lewisi, C. robustus

Senior synonyms: C. leptodirus, Amphicoelias latus, Caulodon diversidens and Caulodon leptoganus.


The boxy head was large for a sauropod with a relatively short neck and moderately long tail. The front legs are slightly longer than back legs. Young feed lower on less course food like the diplodocids. It had a large blunt head with a short face and big eyes. It stood higher at the shoulders than at the hips. Its skull was lightly built, and it probably had a good sense of smell.


LENGTH: 14 m (46 ft). WEIGHT: 10 - 12 tons.


It was Medium to high browser with teeth able to process course vegetation.

History of Discovery

Discovered by Cope, 1877 and known from many partial skeletons and skulls, isolated bones.


Found in North America (Utah and Colorado USA) in semi arid plains with forested rivers with a short rainy season.


1. Paul, G. (2010). The Princeton Field Guide to Dinosaurs (pp. 4625). Princeton, New Jersey: University Press Princeton.

2. Worth, G. (1999). The Dinosaur Encyclopaedia (pp. 523). Scarborough, Western Australia: HyperWorks Reference Software.