Plants
            
                Sponges
            
                Tabulate corals
            
                Rugose corals
            
                Gastropods
            
                Bivalves
            
                Cephalopods
            
                Bryozoans
            
                Brachiopods
            
                Trilobites
            
                Chelicerates
            
                Insects
            
                Echinoderms
            
                Agnathans
            
                Placoderms
            
                Mammals
            
                Graptolites
            
                Conodonts
            
                Scolecodonts
            
                Ostracods
            
                Chitinozoans
            
                Acritarchs
            
                Foraminiferans
            
                Trace fossils