Genus: Einiosaurus SAMPSON, 1995
Etymology: Eini (= buffalo, Blackfeet Indian), and sauros (= lizard, Latinized Greek), pronounced “eye-knee-o-saurus. The generic name honors the Blackfeet tribe on whose land the fossils were found, and refers to the contention that ceratopsids were the buffalo of the Cretaceous, living in large herds, and possessing relatively complex social organizations.

Species: procurvicornis SAMPSON, 1995
Etymology: Pro, forward, Latin, and curvus, cuve, Latin, and cornu, horn, Greek, meaning “forward-curving horn”.

Holotype: MOR 456-8-9-1

Locality: Canyon Bonebed (CBB), Landslide Butte Field Area, approximately 42 km northwest of Cut Bank, Glacier County, Montana.

Horizon: Two Medicine Formation.


Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material: Incomplete skull with nasal horn, supraorbital regions and partial paritial.

Referred material:

MOR 456 8-27-87-1: Extra foramen, puckered lesion (TANKE & FARKE, 2006)
Note: Some of the orbital horncores (bosses) have pitting from resorption pits.