Hadrosaurus, the duck-billed dinosaur named from New Jersey

When and where

Hadrosaurus lived in North America during the Late Cretaceous, about 83.6 to 77.9 million years ago. Its best-known fossils come from the Woodbury Formation in New Jersey, a coastal setting very different from the inland dinosaur beds of the American West. The animal belonged to the hadrosaurid ornithopods, the broad group often called duck-billed dinosaurs because of their flattened snouts and plant-shearing jaws.

How we know

The key Hadrosaurus specimen came from Haddonfield, New Jersey, where local marl pit workers uncovered bones in 1858. William Parker Foulke investigated the find, and Joseph Leidy described it as Hadrosaurus foulkii. The skeleton was incomplete, but it included enough limb material to show that this dinosaur could stand upright on its hind legs. That made it one of the first dinosaur mounts in the world to be shown in a lifelike pose rather than as a flat set of bones. Some additional material has been reported from the Tar Heel and Coachman formations. Source: Wikipedia.

What set it apart

Hadrosaurus matters because of timing and context. It was not the largest hadrosaur, and it did not carry a tall crest like Parasaurolophus. Its importance comes from the New Jersey skeleton and what that find changed. In the mid-1800s, dinosaurs were still poorly understood animals known mostly from scattered bones. Hadrosaurus gave researchers a partial body plan: strong hind limbs, shorter forelimbs, and a deep plant-eating frame. The holotype also came from sediments that suggest the carcass had been carried by water and washed out toward the sea, which explains why the find is incomplete but still useful.

For collectors and classrooms

A Hadrosaurus model is hard to source on Amazon UK right now, so this classroom pick uses a close hadrosaurid relative instead. Pair the New Jersey fossil story with a crested Parasaurolophus model so students can compare plain and ornamented duck-billed forms, then talk about why some famous fossils never become common toy lines. The collector pick is here: Parasaurolophus figurine.