Sterkfontein excavation site (IMAGE) University of the Witwatersrand Caption The Sterkfontein excavation site, which exposes the ancient deposits that once formed underground and contain Australopithecus fossils. The fossil-bearing red sediments clearly contrast with the grey dolomite of the cave walls and remnant roof of the chamber. Credit Dominic Stratford Usage Restrictions No restrictions. License Public Domain 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.