text: No reliable chronology for Africa's rock-art has been established as yet, nor have the sequences of the various styles been analyzed in any serious or convincing manner. In view of the fact that both petrographs and petroglyphs of southern Europe belong to specific periods of the Old and New Stone Ages there, several investigators of the African rock-art have been inclined to draw parallels between Europe and Africa not only in style but also in chronology. Serious students of African archaeology no longer follow such practices, and content themselves in finding in Africa only the evidence that would produce a stratigraphy and would permit the establishment of a reliable chronology for this remarkable African art.  
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  Fig. 3. Bushman ornaments. Necklace made of ostrich egg shell discs ( 170 cm . long) and bracelets cut from the hide of a zebra. (diameter ca. 6 cm .)