Utah Fossils Point to Unknown Armored Dinosaur
Fossils from the Ironstone Bonebed, dated to roughly 140 million years, are still under study before any naming.
Updated on Nov. 6, 2026 in Geology
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Utah Geological Survey reported that fossils from the newly opened Ironstone Bonebed, north of Arches National Park, appear to belong to a previously unknown armored dinosaur species. The fossils date back roughly 140 million years, and four kinds of dinosaurs have been identified at the site so far. The find is at the research stage; the species has not yet been formally described or named.
Why it matters
The discovery adds to Utah's record of Jurassic-era fauna and shows how a single excavation can surface multiple dinosaur types. Naming and describing the species will depend on the scientific study now underway, which typically precedes any formal classification.
The evidence is fossil identification from an active excavation, with an age of roughly 140 million years estimated from the site's geology. Four dinosaur types have been identified so far, but the source gives no specimen count, and the armored species remains unconfirmed until formal study is complete.
The players
Utah Geological Survey
The state agency that reported the fossil find and oversees paleontological research in Utah.
Jim Kirkland
Utah's state paleontologist who leads the Ironstone Bonebed dig and plans to name the new dinosaur species.
Don DeBlieux
Utah's assistant state paleontologist, who retires at the end of 2026 and is to be honored by the species name.
The details
Paleontologists are excavating the Ironstone Bonebed, a newly opened dig site that sits on top of the Morrison Formation, a sedimentary rock layer that preserves Jurassic-era remains. The fossils are being studied scientifically to describe the animal's anatomy and distinguish it from known species, a process that must be completed before a new species can be officially named. The excavation is expected to keep researchers busy for years, and work on the individual location could take decades.
Timeline
Fossils are roughly 140 million years old, dating to the late Jurassic period.
The Jurassic extinction event, when many Utah dinosaurs disappeared, marks the end of that era.
Jim Kirkland and Don DeBlieux have worked together for 25 years.
Don DeBlieux retires from his state position at the end of 2026.
The Tech Race
The Ironstone Bonebed excavation adds to Utah's Morrison Formation record, which already includes dinosaurs from the Jurassic period. Its four identified dinosaur types make it a candidate for comparison with other Morrison-era sites as paleontologists map the region's fauna.
The find does not change anything for most readers in the near term, since the species has not yet been formally named. Visitors to the region may eventually see the species in museum exhibits once study and naming are complete, but no timeline for that has been announced.
The takeaway
Watch for the formal scientific description and naming of the armored species, which will confirm whether the fossils represent a new species. The excavation's continued findings at the Ironstone Bonebed will also show whether the site yields additional new species beyond the four already identified.
Further reading
For more on the rock layers that preserve these finds, explore Geology coverage across the region.
Source note: This article includes information reported by KSL.
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