| Geology of the Mesozoic Era
Dinosaur National Monument Apatosaurus louisae, Stegosaurus ungulatus, Allosaurus fragilis, Camarasaurus lentus, Camptosaurus aphanocetes Dinosaur National Monument was the greatest dinosaur discovery in the history of Carnegie Museum, and one of the greatest finds of all time. These specimens were found embedded in a coarse-grained sandstone of the Jurassic Morrison Formation of northeastern Utah in 1909. The highly localized sandstone lens that contains these bones is enclosed within green shale and claystone that are suggestive of a lake deposit. The quarry sandstone is interpreted as a river channel deposit that, during flooding, carved a new route into an ancient lake bed.
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