From which specific Canadian geological layer did the fossil evidence for Xenoceratops foremostensis originate?

The Oldman Formation in Alberta, Canada

The basis of knowledge regarding Xenoceratops foremostensis stems directly from fossil evidence unearthed from the Oldman Formation, located in Alberta, Canada. This geological layer is significant because it preserves a snapshot of life immediately preceding the mass extinction event. The presence of Xenoceratops within this specific strata provides crucial information about the biodiversity present in the ceratopsian fauna in that region during that particular time slice in the Late Cretaceous period. This location is key to understanding the baseline evolution of ceratopsids in Northern North America before later, potentially more derived forms appeared elsewhere.