Styracosaurus Timeline

 
 
Styracosaurus   >   Timeline

   



Styracosaurus Timeline

Time
 
Event
 
Approximately
220 million years ago
 
First dinosaurs evolve during the Triassic period.
 
Approximately
76 million years ago
 
Styracosaurus first evolves.

Styracosaurus

 
Approximately
70 (?) million years ago
 
Styracosaurus extinct.
 
Approximately
65 million years ago
 
Cretaceous-Tertiary extinction event: All non-avian dinosaurs go extinct (although of course Styracosaurus has already been extinct for several 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

 
1912
 
First fossils of Styracosaurus found by C.M. Sternberg in the Dinosaur Park Formation, Dinosaur Provincial Park, Alberta Canada.
 
1913
 
Lawrence Lambe describes and names Styracosaurus albertensis.
 
1915
 
Lawrence Lambe describes and names Styracosaurus albertensis.
 
1915
 
A team from thje American Museum of Natural History led by Barnum Brown finds a nearly complete articulated skeleton of Styracosaurus including a partial skull.

Barnum Brown:
Barnum Brown

 
1922
 
The discovery of Protoceratops sheds some light on what early Ceratopsian dinosaurs, including the ancestors of Styracosaurus, must have been like.

Protoceratops:
Protoceratops

 
1930
 
Charles W. Gilmore describes as a specimen which came from the Two Medicine Formation in Montana as a new species, Styracosaurus ovatus. In retrospect and with the benefit of hindsight, this is probably a mistake, as more recent research (2010) suggests it should be placed in a separate genus, "Rubeosaurus".

Charles W. Gilmore:
Charles W. Gilmore

 
1937
 
A paper describing Barnum Brown's find, assigns it to a new species Styracosaurus parksi. In retrospect and with the benefit of hindsight, this is probably a mistake, as it most likely an example of Styracosaurus albertensis.
 
2010
 
McDonald and Horner suggest that Gilmore's Styracosaurus ovatus should actually be a different genus, which they call "Rubeosaurus".
 



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