Where were the remains of *Xenoceratops* formally described from?
Answer
Judith River Formation of Alberta, Canada
The holotype fossil material that defines the genus *Xenoceratops* originated from a specific and well-studied geological unit known for its rich diversity of Late Cretaceous fauna. This unit is the Judith River Formation, located in Alberta, Canada. The discovery site is crucial as it dates the animal to the Campanian stage, approximately 78 to 77 million years ago, allowing paleontologists to study its coexistence and ecological interactions, a concept known as sympatry, with other ceratopsids found in the same rock layer.

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