Cutting through sponge and time – a new record of Koptichnus rasmussenae (trace fossil) from the Kerteminde Marl (middle Paleocene), Denmark

A new trace fossil, Koptichnus rasmussenae, was recently reported from the Cretaceous of Denmark. This burrow is thickly lined with cuboids that tracemaker cut siliceous sponges. newly discovered specimen lower Selandian Kerteminde Marl, found in a loose boulder Gundstrup gravel pit (Fyn, Denmark), extends stratigraphical range this ichnotaxon previously known Coniacian to middle Paleocene and demonstrates distinct behaviour harvesting shaping building material survived K-Pg extinction event.