The name Gargoyleosaurus means gargoyle lizard comes under the family of ankylosaurs which was believed to be an oldest specimen found out with the help of the fragments discovered till date. The measurement of the skull is 29 cm (11 in) length wise and the body’s entire length ranges from 3 to 4 meters which is 9.8 to 13.1 in feet. The weight is assumed to be 1 ton which is 2,200 lb. The fragments were found in the regions of Upper Jurassic in the time scales of Kimmeridgian to Tithonian under the rocky formations of Morrison in the Bone Cabin Quarry West locality in the Albany County.
The similar kind of specimen known as G. parkpinorum known as G. parkpini was explained through through Ken Carpenter et al in the year 1998. The skeletal arrangements of the animal is found in the Denver Museum of Nature and Science ,the holotype is gathered in the Western Paleontology Labs in the year of 1996 now it is maintained by the collections of the Denver Museum of Nature and Science in Denver coming under the Colorado province. Gargoyleosaurus originated from the Morrison Formation from the stratigraphic zone 2.
Apart from that of the holotype a few fragments of the skeleton have been discovered, This holotype has been found to contain majority parts of the skull only and partly the postcranical skeleton too.