La cueva de El Sidrón (IMAGE) Spanish National Research Council (CSIC) Caption El investigador del CSIC Antonio Rosas, en la cueva de El Sidrón (Asturias) Credit Joan Costa / CSIC Usage Restrictions The image may only be used with appropriate caption or credit. 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.