As a Weapon
Humans living in those early days had a lot of dangerous predators, and so they needed a form of protection. Thus, they had to find a way to keep themselves and those around them safe. The spiked mace of the glyptodon tails made a great weapon, especially for hunters. They used the bones as tools seeing they were heavy and strong. Also, managing to hunt and capture a glyptodon gave you lots of credits seeing how big and powerful they were. So, if you ask us, they served humans a lot of purposes in those days.
Investigations Continued
The fossils discovered in Argentina were considered to be very important. One of the archaeologists on the team, Pablo Messineo, noted that the discovery of the four animals (who seemingly died together), would clear the way for extensive research to be carried out. In the process, they would highlight new details not yet known to anyone. To ensure they were on the right track with their investigations, they carried out DNA testing on the samples. So, what was their next move?