Genus
Valid Extinct

Monoclonius

Cope 1876

Monoclonius is an extinct dubious genus of herbivorous ceratopsian dinosaur found in the Late Cretaceous layers of the Judith River Formation in Montana, United States, and the uppermost rock layers of the Dinosaur Park Formation in Alberta, Canada dated to between 75 and 74.6 million years ago.

Temporal range
Triassic
Jurassic
Cretaceous
Paleogene
Neogene
252 201 145 66 0 Ma
PBDB occurrences
13
Group
Dinosaures
Herbivore Ground dwelling Terrestrial
Monoclonius
click to enlarge
Nasal horn base and holotype frill of Monoclonius crassus, AMNH 3998. © Hatcher, J. B. , O. C. Marsh , and R. S. Lull · Public domain · Wikimedia
Monoclonius
Monoclonius
PBDB ↗ Wikipedia ↗
Classification
Dinosauria Unranked clade
›
Ornithischia Unranked clade
›
Neornithischia Unranked clade
›
Pyrodontia Unranked clade
›
Cerapoda Unranked clade
›
Marginocephalia Unranked clade
›
Ceratopsia Suborder
›
Ceratopsidae Family
›
Centrosaurinae Subfamily
›
Monoclonius Genus
Measurements
Length
5,4 m ⓘ
Monoclonius lowei
Mass
2 000 kg ⓘ
Monoclonius lowei
Fossil sites 13 geolocated sites
Distribution
Top countries
🇺🇸 United States
7
🇨🇦 Canada
6
Geological formations
Oldman
5
Judith River
3
Kirtland
2
Fruitland
1
Cokedale
1
Temporal distribution
Campanian (83.6–72.2 Ma)
13
Species (5)
Monoclonius crassus 84 Ma
Monoclonius fissus nomen dubium, species not entered Monoclonius
Monoclonius lowei subjective synonym of Monoclonius crassus 84 Ma
Monoclonius recurvicornis nomen dubium, species not entered Monoclonius 84 Ma
Monoclonius sphenocerus nomen dubium, species not entered Monoclonius 84 Ma
Synonyms (3)
Monoclonius fissus nomen dubium, species not entered Monoclonius
Monoclonius recurvicornis nomen dubium, species not entered Monoclonius
Monoclonius sphenocerus nomen dubium, species not entered Monoclonius
Images 2
Bibliography
Original description
E. D. Cope. 1876. Descriptions of some vertebrate remains from the Fort Union Beds of Montana. Proceedings of the Academy of Natural Sciences of Philadelphia 28:248-261
Bibliography (8)
B. S. Kues, J. W. Froehlich, and J. A. Schiebout, S. G. Lucas. 1977. Paleontological survey, resource assessment, and mitigation plan for the Bisti-Star Lake Area, northwestern New Mexico. Report to the Bureau of Land Management, Albuquerque, New Mexico
A. E. Roberts. 1972. Cretaceous and early Tertiary depositional and tectonic history of the Livingston area, southwestern Montana. United States Geological Survey Professional Paper 526-C:1-120 DOI ↗
L. S. Russell. 1966. Dinosaur hunting in western Canada. Royal Ontario Museum, Life Sciences Contribution 70:1-37 DOI ↗
C. M. Sternberg. 1938. Monoclonius from southeastern Alberta compared with Centrosaurus. Journal of Paleontology 12(3):284-286
R. S. Lull. 1933. A revision of the Ceratopsia or horned dinosaurs. Memoirs of the Peabody Museum of Natural History 3(3):1-175 DOI ↗
B. Brown. 1914. Cretaceous Eocene correlation in New Mexico, Wyoming, Montana, Alberta. Bulletin of the Geological Society of America 25:355-380 DOI ↗
E. D. Cope. 1889. The horned Dinosauria of the Laramie. The American Naturalist 23(272):715-717
E. D. Cope. 1876. Descriptions of some vertebrate remains from the Fort Union Beds of Montana. Proceedings of the Academy of Natural Sciences of Philadelphia 28:248-261