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