Portfjeld Formation (IMAGE) Uppsala University Caption Northern Greenland's Portfjeld Formation, more than half a billion years old, contains embryo-like microfossils. Credit John Peel Usage Restrictions This image may only be used when reporting about John Peel's reseach. 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.