Carved mussel shells found in the Murray Riverlands of South Australia could provide insight into technologies used by First Nations peoples.
Archaeology Professor Amy Roberts says the shells represent a huge timespan, showing how busy the area was to the local Ngarrindjeri people over thousands of years.
One shell with a serrated edge, believed to be more than six thousand years old, was possibly used as an eating utensil, while others may have been merely ornamental.