Monoclonius

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.

Monoclonius

Hatcher, J. B. , O. C. Marsh , and R. S. Lull · Public Domain · via Wikipedia/Commons. May be a photograph of a specimen, or an artist’s reconstruction — an interpretation of a skeleton, since colour and soft tissue are almost never preserved.

On record

Recorded, not inferred
Sits inside
CentrosaurinaePBDB
Diet
herbivorePBDB, for Ceratopsia
Life habit
ground dwellingPBDB, for Ceratopsia
Motility
actively mobilePBDB, for Ornithischia
Environment
terrestrialPBDB, for Ceratopsia

Time the record covers

At most 12 million years on record.

Every occurrence read is dated to somewhere between 83.6 Mya and 72.2 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Late Cretaceous — about 13 of 13 occurrencesLate Cretaceous84–83 Mya — about 0.4 occurrences83–83 Mya — about 0.5 occurrences83–82 Mya — about 0.5 occurrences82–82 Mya — about 0.5 occurrences82–82 Mya — about 0.5 occurrences82–81 Mya — about 0.5 occurrences81–81 Mya — about 0.5 occurrences81–80 Mya — about 0.5 occurrences80–80 Mya — about 0.5 occurrences80–80 Mya — about 0.5 occurrences80–79 Mya — about 0.5 occurrences79–79 Mya — about 0.5 occurrences79–78 Mya — about 0.5 occurrences78–78 Mya — about 0.5 occurrences78–77 Mya — about 0.5 occurrences77–77 Mya — about 0.5 occurrences77–77 Mya — about 0.5 occurrences77–76 Mya — about 0.5 occurrences76–76 Mya — about 0.5 occurrences76–75 Mya — about 0.5 occurrences75–75 Mya — about 0.5 occurrences75–75 Mya — about 0.5 occurrences75–74 Mya — about 0.5 occurrences74–74 Mya — about 0.5 occurrences74–73 Mya — about 0.5 occurrences73–73 Mya — about 0.5 occurrences73–73 Mya — about 0.5 occurrences73–72 Mya — about 0.4 occurrences84.1 Mya71.7 Mya

13 occurrences of Monoclonius on record, most of them in the Late Cretaceous. Bar height is expected occurrences, not a count: each fossil is spread across the span it is dated to, so a tall narrow bar means tight dating and a low wide one means loose.

When

13 occurrences

These are dates about fossils, not the animal: the record can only begin after it arose and end before it died out, so either end may reach further. Shares are expected occurrences: a fossil dated to a span is counted partly in each period it straddles. More on what this infers.

Found in

5 formations

Oldman — 49.36°N, 110.58°WOldman — 50.87°N, 111.16°WOldman — 50.60°N, 111.62°WOldman — 50.69°N, 111.62°WJudith River — 47.77°N, 108.95°WJudith River — 47.74°N, 109.62°WKirtland — 36.27°N, 108.17°WKirtland — 36.70°N, 108.30°WFruitland — 36.62°N, 108.46°WCokedale — 45.64°N, 110.70°W

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The named rock units Monoclonius has been recovered from, largest first. Drawn where the rock is now, not where it formed. 1 occurrence has no formation on record, which is common for older literature.

Monoclonius and its relatives

Late Cretaceous

Where Monoclonius and its relatives were recorded in the Late Cretaceous.

Found in the same rock

12 taxa

The Paleobiology Database records 13 sites for Monoclonius, and this reads all of them. The number is how many of those sites it was catalogued from too.

This is not a list of everything alive at the time. It is only what has come out of the same ground as this animal and been written down.

Entered from

8 references

Each of the 13 occurrences read was entered from one of these publications, ordered by how many each accounts for. This is not a search for papers mentioning the name. Entries link to doi.org where the Paleobiology Database holds an identifier, and to its own record where it does not. Relayed as the Paleobiology Database holds them, not checked against what they resolve to.

Media and terms

Media content3

Picture of Monoclonius

Credit
Hatcher, J. B. , O. C. Marsh , and R. S. Lull
Licence
Public Domain
Commercial use
the licence allows it

Photogrammetry

Licence
In Copyright
Commercial use
cannot be read from the licence given — check the record
Specimen
Monoclonius crassus · AMNH:FARB:3998

3D model

Source
Sketchfab
Credit
PeePmono
Licence
CC Attribution
Commercial use
cannot be read from the licence given — check the record

The description on this site

Licence
CC BY-SA 4.0

This is what the site found, which is not the same as what exists.

Keep going

What may have been alongside itCentrosaurinae through timeFormations of the Late CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Cope 1876