Close-up of Domical Stromatolite (IMAGE) California Institute of Technology Caption This is a close-up, cross-section view of the interior of a domical stromatolite. The black layers are the "cooked" organic remains of Early Archean microbial mats. Credit Abigail Allwood Usage Restrictions With credit as given above 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.