Shell midden on our farm consisting mainly of Perlemoen shells

Our family owns a coastal farm near the Southern most tip of Africa and many of these shell middens are found on our property. 80% of the shells in the middens are Perlemoen shells. According to the late archaeologist, professor H Deacon, the biggest known concentration of these shell middens in South Africa are on our farm. Perlemoen poaching is a huge concern for our family.