These images depict a slice of a coal ball from the Pennsylvanian period (~300 million years ago), that contains permineralized plant material from a peat swamp. CT allows us to distinguish the plant organs contained within a coal ball for taxonomic identification. The images were taken using an X5000 NSI High-Resolution Micro-CT and rendered in Imaris at the Carl R. Woese Institute at the Genomic Biology Core Facility.