Ceratosaurus Timeline

Ceratosaurus   >   Timeline


Ceratosaurus Timeline

220 million years ago
First dinosaurs evolve during the Triassic period.
156 million years ago
First Ceratosaurus appears during the Jurassic period.


145 million years ago
Ceratosaurus extinct.
65 million years ago
Cretaceous-Tertiary extinction event: All non-avian dinosaurs go extinct (although of course Ceratosaurus has already been extinct for many million years by this time).

The K/T Extinction Event may have been caused by an asteroid impact:
K/T Extinction Event may have been caused by an asteroid impact

Othniel C. Marsh discovers, names and describes a Ceratosaurus species - Ceratosaurus nasicornis.

Othniel C. Marsh:
Othniel C. Marsh

Othniel C. Marsh publishes a skeletal reconstruction of Ceratosaurus.

Ceratosaurus reconstruction by Othniel C. Marsh, 1896
(Note: Incorrect upright posture and pronated hands):
Incorrect Ceratosaurus reconstruction by Othniel C. Marsh, 1896 - Note: upright posture and pronated hands

Charles W. Gilmore redescribes Ceratosaurus, agreeing with many of Marsh's conclusions including the probable use of the animal's nasal horn.
David Bruce Norman suggests the nasal horn was probably used in interspecies contests.
Fossils attributed to a new Ceratosaurus species, Ceratosaurus magnicornis are found in the Fruita Paleontontological Area, outside Fruita, Colorado. Many scientists now however believe that these fossils are not from a Ceratosaurus.
Fossils attributed to a new Ceratosaurus species, Ceratosaurus dentisulcatus are found in Portugal. Many scientists now however believe that these fossils are not from a Ceratosaurus.

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