Jack Horner

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Entrants falling and tumbling over while chasing the cheese at the 2016 'Cheese Rolling' held at Cooper's Hill, in the Cotswolds, Brockworth England

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illustration of the walking titanosaurus, Patagotitan mayorum

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African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

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Groups of depositors in front of the closed American Union Bank, New York City. April 26, 1932. Great Depression run on bank crowd

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Battle of the Alamo from "Texas: An Epitome of Texas History from the Filibustering and Revolutionary Eras to the Independence of the Republic, 1897. Texas Revolution, Texas revolt, Texas independence, Texas history.

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Lusitania sinking, illustration from The War of the Nations (New York), December 31, 1919. World War I, WWI. This image is one of three on the page. (See source file for the other two.)

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Rural Irish landscape, Sligo, Ireland.

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Jack Horner

American paleontologist

Also known as: John R. Horner

Learn about this topic in these articles:

contribution to paleontology

In dinosaur: Reproduction
In 1978 John R. Horner and his field crews from Princeton University discovered dinosaur nests in western Montana. A few other finds, mostly of eggshell fragments from a number of sites, established oviparity as the only known mode of reproduction. In recent years an increasing number of…
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discovery of Achelousaurus

In Achelousaurus: Fossil discoveries
American paleontologist Jack Horner was responsible for leading the team of researchers that uncovered the first Achelousaurus skull, MOR 485, in 1987, with Sid Hofsteader credited with the skull’s discovery. The fossil lay in the uppermost 20 meters (65.6 feet) of the formation. The species was first…
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