Species: textilis MARSH, 1889
Etymology: Latin, textilis, "woven."
= Modosaurus textilis KEYES, 1894 (sic)

Holotype: YPM 1815

Locality: Probably sec. 9 or 10, T22N, R76W, Albany County, Wyoming. (was 1 1/2 miles east and south of the famous Quarry 13, on an easterly slope of the Como anticline, 6 miles east of Medicine Bow, Albany County (Carbon County, Ostrom, 1965), sec. 7, T77N, R22W, Wyoming.)

Horizon: Belle Fourche Member, Frontier Formation.

Note: From a marine formation.

Biostratigraphy:

Age: Middle Cenomanian Stage, Uppermiddle Gallic Subepoch, Lowermost Gulf Epoch, Middle Cretaceous.

(Was Uncertain, may be from (?) Dakota Formation, Thermopolis Formation or Mowry Formation, Albian-Early Cenomanian, Late Cretaceous.)

Material: Skull fragment, 3 dorsal, 13 caudal vertebrae, sacrum, ribs, fragments of scapulae, both ilia, fragments of humerus, partial left radius and ulna, metacarpals, left femur, 2 tibiae, partial left fibula, almost complete left pes and armor, keeled plate, caudal plate and a spine-like plate.