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DVL-0056Specimen Record

Gastonia

Gastonia burgei

gas-TOH-nee-ah BUR-jee

AI Reconstruction of Gastonia burgei, showing its heavily armored body with prominent lateral spikes, generated in 2026
  • Shoulder Spikes: Huge, flat triangular spikes stuck out sideways from the shoulder area like deadly warning signs. These bony weapons meant that any predator trying to attack from the side—like the fearsome Utahraptor—would basically be throwing itself onto a row of blades. No biting required; just standing there was dangerous enough.
  • Hip Shield: The hip region was covered by a solid sheet of armor plates fused together into one rigid shield. This bony shell protected the back end and vital organs from predators sneaking up from behind. A related armored dinosaur from Europe called Polacanthus had the same feature, hinting they inherited this defense from a common ancestor.
  • Blade-Like Side Armor: Curved, blade-shaped armor plates ran along both sides of the body, angled outward and upward. Instead of just a few isolated spikes, these formed an almost continuous cutting edge along each flank—like a living wall of knives. Scientists pieced together their arrangement from jumbled bones of multiple individuals found buried together.
  • Leaf-Shaped Teeth: Small teeth shaped like little leaves with jagged edges were perfect for snipping off low-growing plants, but not for heavy chewing. Unlike duckbilled dinosaurs with their hundreds of grinding teeth, this plant-eater probably relied on a powerful gut to break down tough vegetation after swallowing it.
  • Low and Wide Body: Built like a tank, this dinosaur had a super-wide body that hugged close to the ground. That low center of gravity made it nearly impossible for predators to knock it over and get at its softer belly. The proportions of its leg bones and the spread of its armor show just how broad and stable this living fortress really was.
●Early Cretaceous145–100.5 mya🌿 Herbivore🐾 Quadruped

Gastonia was a heavily armored ankylosaur that lived alongside the fearsome predator Utahraptor in Early Cretaceous Utah. Its body bristled with sharp spikes along its flanks and back, making it a formidable defensive tank of the Mesozoic world.

Did you know?
  • Gastonia had blade-like spikes along its sides so sharp they could have sliced flesh like knives

About

Gastonia burgei represents one of the most spectacularly armored dinosaurs ever discovered, a medium-sized nodosaurid that patrolled the floodplains of Early Cretaceous North America approximately 125 million years ago. This remarkable herbivore was encased in an impressive array of dermal armor including flat triangular spikes projecting from its shoulders, curved blade-like running along its flanks, and a sacral shield of fused plates protecting its hips. Unlike its clubbed-tail cousins the ankylosaurids, Gastonia likely defended itself primarily through its formidable array of lateral spikes.

Discovered in the Cedar Mountain Formation's Gaston Quarry of eastern Utah, Gastonia is known from extensive fossil material including multiple individuals found in close association. This has yielded exceptional specimens preserving the intricate arrangement of armor in life position. Gastonia shared its ecosystem with the giant predator Utahraptor, and paleontologists speculate that its impressive defensive adaptations may have evolved in response to such formidable hunters.

With a broad, low-slung body supported by sturdy limbs, Gastonia was built for stability rather than speed. Its relatively small head contained leaf-shaped teeth adapted for processing low-growing vegetation. The discovery of Gastonia has been crucial for understanding the diversity and evolution of polacanthine ankylosaurs in North America during the Early Cretaceous.

Quick Facts

Scientific name
Gastonia burgei
Group
Ankylosaur · Nodosauridae
Lived
Early Cretaceous, 126–121 million years ago
Diet
Herbivore
Movement
Walked on four legs
Fossils found in
Cedar Mountain Formation (Utah, Colorado, United States)
Discovery credited to
1989, Robert Gaston
Holotype
CEUM 1307, College of Eastern Utah Prehistoric Museum
DinoVault record
DVL-0056

Where fossils were found

Cedar Mountain Formation prehistoric landscape

Cedar Mountain Formation

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Modern location

Utah, Colorado · United States

When it lived

126–121 million years ago(5m year span)

Keep exploring the vault

Utahraptor
🦖 Predator

Utahraptor

Utahraptor ostrommaysorum

Utahraptor and Gastonia are both known from the Cedar Mountain Formation's Yellow Cat Member, representing the apex predator and a heavily-armored herbivore of the same ecosystem.

Borealopelta
🔀 Evolutionary echo

Borealopelta

Borealopelta markmitchelli

Both are nodosaurid ankylosaurs with elaborate shoulder spines and extensive dermal armor.

Ankylosaurus
🔀 Evolutionary echo

Ankylosaurus

Ankylosaurus magniventris

Both are armored ankylosaurs that represent the pinnacle of defensive body plans in ornithischian dinosaurs.

Sauroposeidon
🗺️ Formation neighbor

Sauroposeidon

Sauroposeidon proteles

Sauroposeidon specimens have been referred to the Cedar Mountain Formation (Mussentuchit Member), overlapping geographically with Gastonia's Yellow Cat Member habitat in Utah.

Zuul
🔀 Evolutionary echo

Zuul

Zuul crurivastator

Zuul (ankylosaurid) and Gastonia (nodosaurid) represent parallel developments of elaborate tail weaponry in armored dinosaurs — Zuul with its massive tail club, Gastonia with lateral tail spikes.

Sources & Citation

Cite this record

Records are updated as research changes, so citations include the date you accessed this page.

Length estimates
Kirkland, J.I. (1998). A polacanthine ankylosaur from the Early Cretaceous of eastern Utah. Utah Geological Survey Miscellaneous Publication 99-1
Height estimates
Estimated based on body proportions from Kirkland (1998)
Weight estimates
Carpenter, K. (2001). Phylogenetic analysis of the Ankylosauria. In The Armored Dinosaurs
Speed estimates
Biomechanical estimate based on quadrupedal ankylosaur locomotion