From the vault: Fruita’s Dinosaur Journey Museum hosts jaw bone of extinct mammal |

From the vault: Fruita’s Dinosaur Journey Museum hosts jaw bone of extinct mammal

Caitlin Row
Dinosaur Journey Museum in Fruita hosts a unique find: A lower jaw bone belonging to an extinct mammal, Coryphodon.
Dinosaur Journey Museum |


WHAT: Dinosaur Journey Museum

WHEN: Monday through Saturday, 10 a.m. to 4 p.m.; Sunday, noon to 4 p.m.

WHERE: 550 Jurassic Court, Fruita

COST: $8.50 for adults, $6.50 for seniors, $5.25 for children and $24.50 for immediate family groups


Editor’s note: “From the vault” features fossils and other dinosaur-related historical artifacts currently stored at Dinosaur Journey Museum in Fruita, Colo.

Coryphodon, an extinct herbivore, once lived near waterways across the United States. Remains have been found in Wyoming, Colorado, Utah, Montana, Alabama, Mississippi, New Mexico, North Dakota, and Texas.

Dinosaur Journey Museum in Fruita hosts a unique find of its own: A right dentary bone, which is from the lower jaw from the plant-eating beast.

“The dentary is nearly complete: You can see the large, two pronged mandibular ramus, and the back prong (or posterior condyle) is where the lower jaw articulates with the skull,” said Julia McHugh, Dinosaur Journey’s curator of paleontology. “The very front of the dentary is broken off, so the lower front teeth are missing, but you can clearly see the big molars used for crushing plants.”

According to McHugh: “This fossil was found in the DeBeque Formation by Ivan Kladder in the 1990s and was donated to the museum as part of his collection. Coryphodon is a genus of extinct mammal that lived in the Late Paleocene-Early Eocene Epochs 60-48 million years ago.”

It was also substantial in size. McHugh describes it as growing to be “1 meter high at the shoulder and over 2 meters long.”

“In profile, it would have looked like a rhino or a hippo, with stout legs and a barrel-shaped torso,” she explained. “It’s head was large and sloped like a hippo or a rhino, but did not have tusks like hippos and did not have horns like a rhino.”

Coryphodon belongs to an extinct group on mammals called Pantodonta, which “was one of the first group of mammalian browsers,” McHugh added.

For more information about Dinosaur Journey Museum, visit

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