Figure 1 (IMAGE) University of the Witwatersrand Caption Caption: Map showing the geographic setting of the Mid-Zambezi Basin and Spurwing Island in northwest Zimbabwe Credit: Lara Sciscio Credit Lara Sciscio Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.