• Camarasus skull in the cliff face, rafters on the Green River, McKee Springs petroglyphs

    Dinosaur

    National Monument CO,UT

Glirodon grandis

Artist rendition of glirodon
Artist rendition of Glirodon
Walters & Kissenger, LLC
 
Despite its small size, this skull is remarkably complete. This cast has been painted to show details.

Despite its small size, this skull is remarkably complete. This cast has been painted to show details.

About Glirodon grandis:

Glirodon is a rat-sized Jurassic mammal. It has enlarged upper incisors and the name appropriately means “grand rodent tooth.” It filled the niche that rodents fill today. However, Glirodon is not a rodent.

 
If you look closely at the edges of the skull, you can see some teeth. This specimen has the most complete dentition (set of teeth) of any multituberculate ever found.

If you look closely at the edges of the skull, you can see some teeth. This specimen has the most complete dentition (set of teeth) of any multituberculate ever found.

Why is Glirodon grandis a superstar?

Most Jurassic mammal fossils found are isolated teeth or jaw fragments with teeth. The holotype (the first specimen of the species to be discovered and described) of Glirodon is the front half of a skull found at Dinosaur National Monument. Nevertheless the Glirodon from Dinosaur is the most complete multituberculate skull (a group of extinct rodent-like mammal) from Jurassic North America.

 

Jurassic Fact:It was one of the earliest mammals to have large incisors similar to those in modern mice and rats. However, they are not closely related.

For more information:Visit the Quarry Exhibit Hall where a cast is on display.

Did You Know?

Photo of paleontologist Earl Douglass.

Paleontologist Earl Douglass first came to Utah looking for mammal fossils. He returned in 1909 and discovered an immense deposit of dinosaur bones, now protected at Dinosaur National Monument. Although made famous by dinosaurs, Douglass died preferring his beloved mammal fossils over dinosaurs.