City of Rocks Midden (IMAGE) American Museum of Natural History Caption A Pleistocene-age packrat midden from the City of Rocks National Reserve, south-central Idaho. Credit © Julio Betancourt Usage Restrictions Can be used with appropriate 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.