Top rated graphic: T. gibbosula and C. rustica shells located in layer 4c with the cave in Morocco, which ended up beads from exactly what is now often called the oldest jewelry in the world. Resource: A. Bouzouggar, INSAP, Morocco / Native American beadwork is really a form of artwork https://medium.com/@spoilmevintagediy/the-rich-history-of-beadwork-a-journey-through-the-ages-4e4fd2e474cf