Spatial and temporal trends in the distribution of engraved eggshell fragments: A comparative view from the Holocene archaeological record of southern Africa and southern South America

We compare motifs engraved on ostrich and rhea eggshell fragments from southern Africa and southern South America respectively. These elements were part of water flasks used, transported and cached by huntergatherers. We define trends in the motifs engraved on eggshells, inquire about their temporal and spatial distribution, their diversity and their information content in the context of the social interactions and boundaries developed among mobile peoples. A typology of basic motifs occurring on each side of the Atlantic was built to perform a three-step analysis. The first evaluates motif composition through three periods that we name 'middle', 'initial late' and 'final late' Holocene, the second examines image circulation within each period and the third assesses the information content of the engravings. Even though the ostrich and rhea eggshells' visual repertoires are similar, motif variability and motif spatial distribution between the periods analyzed present differences related to the particular social processes that took place in each region. Ostrich eggshells' higher information content could imply that interaction networks in southern Africa were more extensive than in southern South America. However, sample bias could also be affecting the results obtained.