First Discovered:

Updated May 8, 2019 | Infoplease Staff


Meaning of Name:“iguana tooth”
Period: Triassic Period (240 to 205 million years ago)
Size: 9 - 10 meters long
Weight: 4.5 - 5.5 metric tons
Location:England, Belgium, Germany, Spain, South Dakota, Mongolia, Utah

In 1822 an English woman, Mary Ann Mantell, found a large tooth that was determined to be from a large reptile unlike any previously identified. In 1842, paleontologist Sir Richard Owen named the creature dinosaur, which meant “terrible reptile” — terrible in the sense of awesome or formidable.

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