DinoDigMorrison Formation
Late Jurassic (Kimmeridgian–Tithonian) fluvial unit of the western United States; the source of Stegosaurus, Allosaurus, and the giant sauropods.
Late Jurassic · 161.5–145 Mya
Period
Late Jurassic
Country
United States
About
The Morrison Formation blankets much of the Colorado Plateau and the central Rockies. Its variegated mudstones and braided-river sandstones have produced more named dinosaur species than any other unit in North America.
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Map of known sites
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