Microbial Ichnofossils (IMAGE) Geological Society of America Caption Figure 6 from Nikitczuk et al. This paper is open-access online. Higher-resolution images are available by request. Credit GSA Bulletin and Nikitczuk <i>et al</i>. Usage Restrictions GSA Bulletin and Nikitczuk <i>et al</i>. 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.