Dr Papineau holding rock sample (IMAGE) University College London Caption Dr Dominic Papineau holding a sample of the rock, estimated to be up to 4.28 billion years old. Credit UCL / FILMBRIGHT Usage Restrictions To be used only in relation to this study 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.