Species: crassus MARSH, 1888 (nomen dubium)
Etymology: Latin, crassus, "dense, thick."
= Stegosaurus crassus (MARSH, 1888) HENNING, 1915 (nomen dubium)

Holotype: USNM 2135

Locality: Swampoodle (Muirkirk, MERRILL, 1907), Prince George County, Maryland.

Horizon: Arundel Formation, Potomac Group.

Biostratigraphy:

Age: Upper Aptian-Lower Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.

Material: Tooth.

Referred material:

CARPENTER & KIRKLAND, 1998

USNM 8437, 8438, 8439, 8440, 8441, 337984, 437985, 442458, 442551, 451960, 466057, 481142: Teeth.

 

Locality: Coffee Mine, Muirkirk, Maryland.

Horizon: Arundel Formation, Potomac Group.

Biostratigraphy:

Age: Upper Aptian-Lower Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.

Material:

USNM 9154: Tooth.

 

FREDERICKSON, LIPKA & CIFELLI, 2018

Locality: USNM locality 41614 (Muirkirk site, Hotton Locality), Laurel Quadrangle, USGS 1:24,000, 1979, old open pit clay mine near Muirkirk now Dinosaur Park, Price Georges County, Maryland.

Horizon: Arundel Formation, Potomac Group.

Biostratigraphy:

Age: Upper Aptian-Lower Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.

Material:

USNM 497775-497775: 3 complete and partial teeth.

MARTIN & BRETT-SURMAN, 1992

Locality: Prince George’s County, Maryland.

Horizon: Arundel Formation, Potomac Group.

Biostratigraphy:

Age: Upper Aptian-Lower Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.

Material:

Number: Not given: A large tooth.