Pyritized Trilobite Specimens (IMAGE) Geological Society of America Caption Pyritized trilobite specimens (Triarthrus eatoni) are from the Ordovician Whetstone Gulf Formation (Lorraine Group), upstate New York (USA). Thomas A. Hegna et al., Geology, v. 45, p. 199-202, doi: 10.1130/G38773.1. Copyright The Geological Society of America, 2017. A larger version is available. Credit The authors and Copyright The Geological Society of America Usage Restrictions Credit the authors and Copyright The Geological Society of America 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.