Nanaimo Cycad Fossil (IMAGE) Duke University Caption A fossilized cycad specimen that was sampled for nitrogen isotopes that would indicate the atmosphere it grew in. Credit Michael Kipp – Duke University Usage Restrictions none 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.