Stone Tools (image) Max Planck Institute for the Science of Human History Share Print E-Mail Caption Stone tools found at the Dhaba site corresponding with the Toba volcanic super-eruption levels. Pictured here are diagnostic Middle Palaeolithic core types. Credit Chris Clarkson Usage Restrictions Please provide credit information with reuse Share Print E-Mail 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.