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Apatosaurus

genus

“Brontosaurus”, “Atlantosaurus”

Sensitive Classification

Fossils are sensitive in nature and should not be collected unless it is done legally and responsibly. Vertebrate fossils are illegal to collect on public lands.

On the Web

On Wikipedia

Apatosaurus (; meaning "deceptive lizard") is a genus of herbivorous sauropod dinosaur that lived in North America during the Late Jurassic period. Othniel Charles Marsh described and named the first-known species, A. ajax, in 1877, and a second species, A. louisae, was discovered and named by William H. Holland in 1916. Apatosaurus lived about 152 to 151 million years ago (mya), during the late Kimmeridgian to early Tithonian age, and are now known from fossils in the Morrison Formation of modern-day Colorado, Oklahoma, New Mexico, Wyoming, and Utah in the United States. Apatosaurus had an average length of 21–22.8 m (69–75 ft), and an average mass of 16.4–22.4 t (16.1–22.0 long tons; 18.1–24.7 short tons). A few specimens indicate a maximum length of 11–30% greater than average and a…

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Range Map

Range Maps show field notes recorded by Natural Atlas contributors and other datasets via GBIF.org

Formations Found In

Morrison Formation

20 Observations

Cloverly Formation

10 Observations

Sundance Formation

Cloverly, Morrison, and Sundance Formations (WYKJs;0)

Morrison Formation (OKJm;0)

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