A dynamic model for a meniscus filled tunnel (Ancoricknus n. ichnogen.) from the Jurassic Pecten Sandstone of Milne Land, East Greenland

A new type of meniscus filled tunnel is described and designated Ancorichnus ancorichnus n. ichnogen., n. ichnosp. The trail is functionally analysed in terms of the anchor method used by soft bodied animais in penetrating soft substrates. The whole trace fossil assemblage, consisting of Ancorichnus, Planolites, Muensteria, small meniscus tunnels and Gyrochorte, is described. The structure and trophic groups of the different meniscus filled tunnels are compared.