Figure 3
From: The 20-million-year old lair of an ambush-predatory worm preserved in northeast Taiwan
Iron (Fe) variation across the Pennichnus specimen. (a) Variations in Fe across Pennichnus formosae measured by an Itrax Multiscanner. Fe increases at the burrow lining and remains high through the surrounding disturbed zone (DZ). (b) SEM–EDS analyses of thin sections of the burrow lining and feather-like collapse structures (FCS). The red rectangles mark the thin section locations and the white rectangles mark the part of the thin section analyzed by EDS. The white arrows show that the burrow lining is enriched in Fe but the feather-like collapse structures are not. White scale bar = 1 cm; black scale bar = 200 µm.
