77,000-Year-Old Fossilized Leaves (IMAGE) U.S. National Science Foundation Caption Researchers surmise plant sedges were used to repel mosquitoes from the Sibudu rock shelter site in South Africa, which is near the UThongathi River. This is an image of fossilized leaves found at the site. Credit Lyn Wadley, Wits University Usage Restrictions None License Licensed 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.