Holotype:

Locality: Dragons’ Grave, Niobrara County, Wyoming.

Horizon: Lance Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: Scraps eggshells and juvenile bones.
Note: Found near an Edmontosaurus bonebed.