Armadillo first appeared around 58.7 MYA during the late Paleogene. Glyptodonts, now extinct, were heavily armoured relatives of Armadillo, and thought to have diverged genetically some 35 MYA. True Glyptodonts are found in Miocene deposits and finally became extinct during the Pleistocene, probably due to human activity.
Pleistocene age Armadillo scutes, 1.5 MYA, USA Ancient Armadillo placental mammal scutes, belonging to the species Holmesina septentrionalis. They are Pleistocene age, and around 1.5 million years old. They were found by diving and sieving in the Florida location of St Mark's River, USA