We found this strange object about 20 years ago in Georgia. We used to go to GA every year around Thanksgiving to visit my husband's mother. One year we decided to walk through this woods nearby her home. After 30 min's or so, our young son spotted the tiny white rock(?) sticking out of the ground, It was in a bowl shaped indentation in the ground covered in leaves and debris. Well, we dug it up and brought it back our home in Florida, and it has sat in our garden since. It has been bleached by the FL sun and rain. But we never asked anyone what it is. Does anyone know what it might be?