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Heritage Science
Fig. 4 | Heritage Science

Fig. 4

From: A Raman micro-spectroscopy study of 77,000 to 71,000 year old ochre processing tools from Sibudu, KwaZulu-Natal, South Africa

Fig. 4

a Photographs of the two faces of the polished stone excavated from Hearth 3 of layer LBG (square C4d); b micro-photograph showing striations on the polished edge; c examples of brown residues and d Raman spectra obtained on the grindstone: (A) amorphous carbon, (B) manganese oxide, (C) mixture of manganese oxide and maghemite and (D) anatase

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