= cf. Pachycephalosaurus sp CARPENTER & YOUNG, 2002

Locality: Locality 20, Denver Basin, Colorado.

Horizon: Denver Formation.

Biostratigraphy:

Age: Lancian age, Late Maastrichtian Stage, Uppermost Senonian Subepoch, Uppermost Gulf Epoch, Late Cretaceous.

Material:

DMNH 32649: Portion of skull cap.

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ESTES, 1964

Locality: Unknown, Eastern Wyoming.

Horizon: Lance Formation.

Biostratigraphy:

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

Material:

Number: Not given: A skull fragment.

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SNYDER, McLAIN, WOOD & CHADWICK, 2020

Locality: Hanson Ranch (HR), northern Niobrara County, Eastern Wyoming.

Horizon: Lance Formation.

Biostratigraphy:

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

Material:

Number: Not given: 5 skull fragments.

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TRIEBOLD, 1997

Locality: Sandy Site, Harding County, South Dakota.

Horizon: Hell Creek Formation.

Biostratigraphy:

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

Material:

Number: Not given:

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WALL & GALTON, 1979

Locality: Styracosaurus bonebed, about 3 miles (4.83 km) south of the Steveville Ferry, on the east side of the Red Deer River, Dinosaur Provincial Park, Newell County, Alberta Province, Canada.

Horizon: Dinosaur Park Formation, upper Judith River Group.

Biostratigraphy:

Age: Judithian age, Middle Campanian Stage, middle Senonian subepoch, upper Gulf Epoch, Late Cretaceous.

Material:

BMNH R8646(8648?): A frontoparietal dome.

Locality: Convese County, T39N, R63W, Wyoming.

Horizon: Lance Formation.

Biostratigraphy:

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

Material:

UW 6110: A very shallow dome.

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WILLIAMSON, CARR, WILLIAMS, & TREMAINE, 2009

Locality: Locality BM 2007.1, Carter County, Montana.
Note: Precise locality information is availble at Burpee Museum of Natural History.

Horizon: Hell Creek Formation.

Biostratigraphy:

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

Material:

BMRP 2007.4.4: Partial left squamosal.

Locality: Locality BM 2001.1, Carter County, Montana.
Note: Precise locality information is availble at Burpee Museum of Natural History.

Horizon: Hell Creek Formation.

Biostratigraphy:

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

Material:

BMRP 2006.4.306: Partial right squamosal.