Species: horridus (MARSH, 1889) MARSH, 1889
Etymology:
Referred material:
HAPP & MORROW, 1997, HAPP & MORROW, 2000
Locality: Near Jordan, Montana.
Horizon: Hell Creek Formation.
Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
SUP9713: Skull and fragmentary skeleton of a juvenile.
Note: Skin impressions and teeth marks from crocodilians and small theropods.
Note: HAPP & MORROW, 2000, state that there is soft tissue impressions in the skull.
LARSON, LARSON, OTT & BAKKER, 2007
Locality: Zerbst Ranch, Niobrara County, Wyoming.
Horizon: Lance Formation.Biostratigraphy:
Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.
Material:
BHI 6273: Fragmentary skull and skeleton.
Note: Has skin impressions and is the best 'mummified' ceratopsian specimen.