A team led by American paleontologist Barnum Brown discovered the first Ankylosaurus fossil in the Hell Creek Formation of Montana in 1906. The remains included the top of a skull, as well as vertebrae, ribs, part of a shoulder girdle and armor.
Brown unearthed other Ankylosaurus remains, including scattered pieces of fossilized armor that he initially attributed to another dinosaur he called Dynamosaurus but are now believed to be Ankylosaurus fossils. He unearthed his third specimen in Alberta in 1910 when on an expedition at the Scollard Formation. This discovery included a complete skull and the first known tail club as well as ribs, limb bones and armor. All three of Brown's finds are housed at New York's American Museum of Natural History.
No complete Ankylosaurus skeleton has been unearthed to date. The largest known Ankylosaurus skull was discovered in 1947 in Alberta by Charles M. Sternberg.
Ankylosaurus track ways were found in 1996 in South American, near Sucre, Bolivia.
