Ankylosaurus Timeline

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Ankylosaurus Timeline

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


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

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

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

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

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

Charles Mortram Sternberg and T.P. Channey find another Ankylosaurus specimen including the largest known Ankylosaurus skull.
Ankylosaurus reconstruction features in the World's Fair in New York city.
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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