A shell-boring polychaete worm was found replaced by the mineral limonite-goethite; this fossil is probably a limonite-goethite pseudomorph after pyrite, suggesting that the soft-bodied worm was originally re placed by pyrite. External structures such as a prostomium, anterior tentacle like palps, peristomial cirri, parapodia, setae bundles of the parapodia, and dorsal cirri of the parapodia are preserved. This worm resembles living members of the family Spionidae in form and habit. This discovery extends the known range of this family (Cretaceous?, Miocene to Recent) back about 365 million years to the Devonian period.