Fossil Autotrophe (image) Penn State Share Print E-Mail Caption Lenticular organic microfossils in the Kromberg Formation, Onverwacht Group, Barberton Mountain Land of South Africa. Image shown is an optical photomicrograph of a polished thin section, taken in transmitted light. Credit by Dorothy Oehler on a sample provided by Maud Walsh (Louisiana State University Usage Restrictions non commercial use only Share Print E-Mail 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.