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Gilmoreosaurus

Say it: GIL-more-oh-SORE-us

Name means: “Gilmore's lizard”1

Ate: PlantsBeaked plant-eatersLate Cretaceous

Gilmoreosaurus was a big, plant-eating dinosaur that lived in Asia during the Late Cretaceous. It had a beak and walked on four legs, but could also stand on two. Scientists think it was an early relative of the duck-billed dinosaurs.2 1

Lived

84 to 72 million years ago3

Late Cretaceous

Fossils found in

China (Inner Mongolia) and possibly Uzbekistan3 2

Food

Plants3 2

Length

6 to 6.2 m1 2

Weight

1.2 tonnes to 3.6 tonnes2

When did it live?

Triassic

Jurassic

Cretaceous

252 million years ago20114566, the asteroid

How big was it?

How long was it?

How heavy was it?

as heavy as 2.5 cars

as long as 6 dogs nose to tailas long as 34 bananas end to endas heavy as 120 big dogsas heavy as 720 watermelons

How big was Gilmoreosaurus compared to YOU?

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cool stuff

Fun facts

Gilmoreosaurus was named after Charles Whitney Gilmore, a famous American paleontologist who studied dinosaurs from Asia.2

Its fossils were found in the Iren Dabasu Formation in Inner Mongolia, which was once a floodplain with rivers and lots of plants.2

Gilmoreosaurus lived about 96 million years ago, during the Late Cretaceous period.2

This dinosaur had a mix of features from older iguanodonts and later hadrosaurs, making it an important link in dinosaur evolution.2

The first fossils of Gilmoreosaurus were collected in 1922 and 1923 by a team from the American Museum of Natural History.2

Gilmoreosaurus might have been hunted by the fast-running tyrannosauroid Alectrosaurus, which lived in the same area.2

AI-made picture of Gilmoreosaurus — An AI-made picture of how Gilmoreosaurus might have looked, made by a computer from what scientists know. It is a guess: the real animal may have looked different, and nobody knows its true colours.

you asked

Most asked questions about Gilmoreosaurus

?How big was Gilmoreosaurus?

Gilmoreosaurus was about 6.2 metres long and weighed between 1.2 and 3.6 tonnes.2 1

?What did Gilmoreosaurus eat?

Gilmoreosaurus was a herbivore, meaning it ate plants. It had a beak and browsed on low to medium-height vegetation.2 1

?When did Gilmoreosaurus live?

Gilmoreosaurus lived during the Late Cretaceous period, about 96 million years ago.2 1

?Where was Gilmoreosaurus found?

Gilmoreosaurus fossils were found in the Iren Dabasu Formation in Inner Mongolia, China.2 1

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For dino experts

Scientific name: Gilmoreosaurus
Named by: Brett-Surman 19793
Group: Beaked plant-eaters
Family / clade: Hadrosauroidea3
Classification: Ornithischia > Ornithopoda > Iguanodontia3
Age of the rocks: 84 to 72 million years (Campanian)3
Rock formations: Iren Dabasu3
Countries: China3
Fossil records: 2 in the Paleobiology Database3
Discovery: Gilmoreosaurus was named by Michael Brett-Surman in 1979. The first fossils were found in the 1920s by George Olsen, part of a team led by Walter Granger, in Inner Mongolia, China.2 1
Still debated: Scientists are not sure exactly where Gilmoreosaurus fits in the dinosaur family tree. Some think it is a close relative of hadrosaurs, while others place it just outside the group.2

Where the facts come from

Gilmoreosaurus | Natural History Museum (nhm.ac.uk)
Gilmoreosaurus (en.wikipedia.org)
Gilmoreosaurus in The Paleobiology Database (CC BY 4.0): age, places, rock formations, classification.

Every fact on this page has a number that points to its source. If we got something wrong, sorry, we are dino fans, not a science journal. Tell us at [email protected] and we will fix it.

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