Genus: Trachodon LEIDY, 1856 (nomen dubium)
Etymology: Greek, trachys, “rough” and Greek, odon, “tooth”: “Rough tooth”.
= Tracodon MORRIS, 1978 (sic)

Species: mirabilis LEIDY, 1856 (nomen dubium)
Etymology: Latin, mirabilis "wonderful."
= Hadrosaurus mirabilis (LEIDY, 1856) LEIDY, 1868 (nomen dubium)
= Trachodon mirabile NOPCSA, 1917 (sic)

Holotype: ANSP 9260

Locality: Upper Missouri River, near the mouth of the Judith River, Montana.

Horizon: Judith River Formation.

Biostratigraphy:

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

Material: Unworn crown of one large tooth, 7 large and 10 small tooth fragments.

Referred material:

COPE, 1875

Locality: Near the bad lands of Judith River, Alberta Province, Canada.

Horizon: Judith River Formation.

Biostratigraphy:

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

Material:

Number: Not given: Portions of femora, humeri and ilia.