Ankylosaurus Timeline

 
 
Ankylosaurus   >   Timeline

   



Ankylosaurus Timeline

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

Ankylosaurus

 
Approximately
65 million years ago
 
Cretaceous-Tertiary extinction event: All non-avian dinosaurs (including Ankylosaurus) go extinct.

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

 
1900
 
Barnum Brown finds Ankylosaurus osteoderms (armor bones) mixed with a Tyrannosaurus rex skeletion. However, at the time, and for some years afterwards, they are not recognized as belonging to a separate animal, but are assumed to be part of an armoured Tyrannosaurus relative ("Dynamosaurus imperiosus").

Barnum Brown:
Barnum Brown

 
1906
 
Peter Kaisen who was part of an expedition from the American Museum of Natural History led by Barnum Brown discovers the first fossils to be identified as Ankylosaurus.

Ankylosaurus scapula (from 1906 specimen):
Ankylosaurus scapula

 
1908
 
Barnum Brown writes the first scientific description of Ankylosaurus, and names the genus and species.

Ankylosaurus skeletal reconstruction by Barnum Brown, 1908:
Ankylosaurus skeletal reconstruction by Barnum Brown, 1908

 
1910
 
An expedition led by Barnum Brown find another Ankylosaurus specimen, including a complete skull, mandibles, ribs, vertebrae, limb bones, and armor, as well as the only Ankylosaurus tail club so far found.

Excavation of Ankylosaurus skull (centre, above the pick) by the Red Deer River, 1910:
Excavation of Ankylosaurus skull (centre, above the pick) by the Red Deer River, 1910

 
1947
 
Charles Mortram Sternberg and T.P. Channey find another Ankylosaurus specimen including the largest known Ankylosaurus skull.
 
1964
 
Ankylosaurus reconstruction features in the World's Fair in New York city.
 
1960s
 
Caudal vertebrae of Ankylosaurus are found in the Powder River drainage, Montana, which is also part of the Hell Creek formation.
 



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