A number of people have said they are interested in this topic. Please posts any pictures, information or questions about rocks or fossils here. I'll start off with some odd formations in rock here from the Pennsylvanian period (318.1 to 299.0 mya). They appear to be strips of wood, but why do they always appear as strips, no depth? I can't find anything online. I'm dating them by the fossils found in the rock with them.