[Caitlin]

A couple of wild guesses. 3-5 thousand years old and from the Gulf or maybe an Egyptian tomb.

I read a story recently about very ancient shells from Africa found 300 miles inland!

Shells were also in use as adornments by the Anasazi in Northern AZ from acros the width od CA. I think some have been found that are a thousand years old. White shell, abalone and a couple other color shells are revered to this day and are associated with the four directions among Navajos