A recent study by archaeologist Prof. Peter Mitchell and his colleagues published in Azania: Archaeological Research in Africa examines how ostrich eggshell (OES) beads moved across southeast southern African landscapes during the Pleistocene and Holocene. A recent study by archaeologist Prof. Peter Mitchell and his colleagues published in Azania: Archaeological Research in Africa examines how ostrich eggshell (OES) beads moved across southeast southern African landscapes during the Pleistocene and Holocene. Archaeology Phys.org – latest science and technology news stories