Hidden in plain sight: a microanalytical study of a Middle Stone Age ochre piece trapped inside a micromorphological block sample - Haaland, Magnus M; Strauss, André Menezes; Velliky, Elizabeth C; Mentzer, Susan M; Miller, Christopher E; Niekerk, Karen L. van; Henshilwood, Christopher S (Geoarchaeology. An International Journal, 2020)