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of bivalve shells from the Woodbury Formation, the sedimentary rocks where the Hadrosaurus fossil was found have been dated at some time during the Campanian stage. In 1868, the only known specimen became the first-ever dinosaur skeleton to be mounted. In 1991, Hadrosaurus became the official state dinosaur of New Jersey.

History of discovery

In 1838, John Estaugh Hopkins was

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