Fossils come from the Campanian (Upper Cretaceous) of the Two Medicine Formation of Montana (USA).
The holotype specimen, MOR 294, was found in a layer of the Two Medicine Formation, dating from the Campanian stage, about 75 million years ago.
It is a colonial nesting site on the Willow Creek Anticline in the Two Medicine Formation that is famous for its fossil eggs of Maiasaura, which demonstrated for the first time that at least some dinosaurs cared for their young.
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Egg Mountain was discovered in 1977 by Marion Brandvold, owner of the Trex Agate Rock Shop in Bynum, Montana, who discovered the bones of juvenile dinosaurs at this site.
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The holotype specimen of Acristavus, MOR 1155, was recovered at the Two Medicine Formation, in Teton County, Montana.